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Table of Contents

Homework Assignments

  • Preliminaries:
    • NoSQL server: nosql.felk.cvut.cz
    • Login and password: sent by e-mail
  • Tools:
  • Submissions:
    • Use sftp or WinSCP to upload your submission files to the NoSQL server
    • Put these files into a directory ~/assignments/name/, where name is a name of a given homework
    • I.e. formats, mapreduce, redis, cassandra, mongodb, neo4j (case sensitive)
    • Use ssh or PuTTY to open a remote shell connection to the NoSQL server
    • Based on the instructions provided for a given homework assignment, verify that everything is working as expected
    • Go to the ~/assignments/ directory and execute sudo submit_execute name, where name is the name of the homework
    • Wait for the confirmation of success, otherwise your homework is not considered to be submitted
    • Should any complications appear, send your solution by e-mail to prokoyul@fel.cvut.cz
    • Just for your convenience, you can check the submitted files in the ~/submissions/ directory
    • Upload the report in .pdf to BRUTE.
      • Use the filename: username_number.pdf, where the number is the homework number.
      • The report must fulfil the requirements and have the following structure:
        • A verbal description of the task
        • Code (copy from the file uploaded to the server)
        • Screenshot of code execution on the server
        • If there are several problems, repeat the same for each of them
    • Once the homework is assessed, you will find points and comments in BRUTE
  • Requirements:
    • Respect the prescribed names of individual files to be submitted (case sensitive)
    • Place all the files in the root directory of your submission
    • Do not include shared libraries or files that are not requested
    • I.e. do not submit files that were not explicitly requested
    • Do not redirect or suppress both standard and error outputs in your shell scripts
    • All your files must be syntactically correct and executable without errors

HW0: Topic selection

  • Points: 0
  • Assignment:
    • Choose your distinct topic. You will use it during the semester in all your homework.
    • Possible topics could be: library, cinema, cookbook, university, flights, etc.
    • See the list at the bottom of the page for additional suitable topics, feel free to choose your own topic
  • Submission:
    • Submit the topic to BRUTE in the form of a text document
    • Insert your own topic or write your surname and name near one of the topics into the DS2 topics table
  • Deadline: Sunday 1. 10. 2023 until 23:59

HW1: Data Formats

  • Points: 10 (+2)
  • Assignment:
    • Write down the data for your future database in the form of a denormalized table (or tables).
    • Write this data in xml and json formats.
    • Check their correctness with the online tools XML Validator, JSON Validator
    • (Optional: +2p.) Write the same data as normalized tables in a relational database, and label the relationships between them. Describe the difference between data in relational form and xml (or json) format.
  • Requirements:
    • The data must be semi-structured and hierarchical. Some information must be repeated.
    • The data must contain enclosed arrays, date/time, and geographical coordinates.
  • Submission:
    • Three files must be uploaded to BRUTE: .pdf or .docx file with report, .xml and .json files with data in xml and json formats.
    • .pdf file must contain the topic and data in the table(s).
  • Deadline: Sunday 8. 10. 2023 until 23:59

HW2: MapReduce

  • Points: 20
  • Assignment:
    • Create an input text file with sample data from the domain of your individual topic
      • Insert realistic and non-trivial data about at least 10 entities of one type
      • Put each of these entities on a separate line, i.e. assume that each line of the input file yields one input record
      • Organize the actual entity attributes in whatever way you are able to easily parse
      • E.g. Medvídek 2007 53 100 Trojan Macháček Vilhelmová corresponding to a pattern Movie Year Rating Length Actors…
    • Implement a non-trivial MapReduce job
      • Choose from aggregation, grouping, filtering or any other general MapReduce usage pattern
      • Use WordCount.java source file as a basis for your own implementation
      • Both the Map and Reduce functions should be non-trivial, each about 10 lines of code
      • It is not necessary to implement the Combine function
    • Comment the source file and also provide a description of the problem you are solving
    • You may also create a shell script that allows for the execution of your entire MapReduce job
      • I.e. compile source files, deploy input file, execute the actual job, retrieve its result, …
      • However, this script is not supposed to be submitted and serves just for your own convenience
      • Even if you do so, it will not be used for the purpose of homework assessment in any way
  • Requirements:
    • You may split your MapReduce job implementation into multiple Java source files
      • They all must be located in the submission root directory
      • At least MapReduce.java source file with its public MapReduce class is required
      • This class is expected to represent the main class of the entire MapReduce job
    • Do not change the way how command line arguments are processed
      • I.e. the only two arguments represent the input and output HDFS locations respectively
    • Do not use packages in order to organize your Java source files
    • Assume that only hadoop-common-3.1.1.jar and hadoop-mapreduce-client-core-3.1.1.jar libraries will be linked with your project
    • Do not submit your Netbeans (or any other) project directory, do not submit Hadoop (or any other) libraries
    • Use Java Standard Edition version 7 or newer
    • You are free to use your /user/f231_login/ HDFS home directory for debugging
      • Homework assessment will take place in a different dedicated HDFS directory
  • Submission (NoSQL server):
    • readme.txt: description of the input data structure and objective of the MapReduce job
    • input.txt: text file with your sample input data (i.e. only one input file is permitted)
    • MapReduce.java and possibly additional *.java: Java source files with your MapReduce implementation
    • output.txt: expected output of your MapReduce job
    • Upload to BRUTE: readme.txt and screenshot (or screenshots) of the execution of your homework on the NoSQL server.
  • Tools:
  • References:
  • Server: nosql.felk.cvut.cz
    • Do not forget to execute the homework submission script and make a screenshot!
  • Deadline: Sunday 22. 10. 2023 until 23:59

HW3: Redis

  • Points: 15+10+5
  • Assignment:
    • Mandatory part (15 p.). Create a script (ordinary text file) with a sequence of commands working with Redis
    • Illustrate you can work with all data types (strings, lists, sets, sorted sets and hashes)
    • In particular, perform all the following operations:
      • Strings: 5 insertions (SET), 1 read (GET), 1 update (APPEND, SETRANGE, INCR, …), 1 removal (DEL).
      • Lists: 5 insertions (LPUSH, RPUSH, …), 2 different reads (LPOP, RPOP, LINDEX, LRANGE), 1 removal (LREM).
      • Sets: 5 insertions (SADD), 2 different reads (SISMEMBER, SUNION, SINTER, SDIFF), 1 removal (SREM).
      • Sorted sets: 5 insertions (ZADD), 1 read (ZRANGE, ZRANGEBYSCORE), 1 update (ZINCRBY), 1 removal (ZREM).
      • Hashes: 5 insertions (HSET, HMSET), 2 different reads (HGET, HMGET, HKEYS, HVALS, …), 1 removal (HDEL).
      • Geographic coordinates: 5 insertions, 1 GEOSEARCH, 1 GEODIST.
    • Your database (i.e. keys and values) as well as commands must be realistic and within your individual topic
      • E.g. use a hash to store a mapping from seats to passengers for each flight
      • HMSET seat-map-EK140-20171121 42A Peter 65F John
      • Key seat-map-EK140-20171121 is composed from a fixed prefix (seat-map), flight number (EK140) and date of departure (20171121)
      • The actual mapping contains pairs of seat numbers and passenger names, e.g. 42A Peter
    • Add comments to your script using the ECHO command
      • Describe at least the intended structure of your keys and values in natural language
    • Extended part (10 p.). Create tables in the PostgreSQL database and fill them with data. Implement the use of Redis for cache.
      • It is supposed to create a cache for reading queries. It is necessary to write some non-trivial SQL queries (with some conditions) and use them to demonstrate the work of the cache. It is not necessary to create too complex queries.
      • Your PostgreSQL database name is db_username (for example, db_f231_student). Use the same password you received for your account at the beginning of the semester. Details about the remote connection are sent to you by email.
    • Optional part (+5 points). Create an application with a graphical user interface for the extended task.
  • Requirements:
    • Only use the database you are supposed to use when working on the assignment
      • Your database number was sent to you by email.
  • Submission:
    • script.txt: text file with Redis database commands, script_pg.py with Python script for Extended task.
    • Submit to BRUTE script.txt, script_pg.py and document with SQL queries (creation of the table/tables and insertion of data) and a screenshot of execution on the NoSQL server
  • Execution:
    • Execute the following shell command to evaluate the whole REDIS script
      • cat $ScriptFile | redis-cli -n $DatabaseNumber
      • $ScriptFile is a file with REDIS commands to be executed, i.e. script.txt
      • $DatabaseNumber is a number of database to be used, e.g. 5
  • Tools:
    • Redis 3.2.4 (installed on the NoSQL server)
  • References:
  • Server: nosql.felk.cvut.cz
    • Do not forget to execute the homework submission script!
  • Deadline: Sunday 5. 11. 2023 until 23:59. Deadline for the optional part: Sunday 17. 12. 2023 until 23:59.

HW4: Cassandra

  • Points: 20
  • Assignment:
    • Create a script (ordinary text file) with a sequence of CQL statements working with Cassandra database
    • Define a schema for 2 tables for entities of different types
      • Define at least one column for each of the following data types: tuple, list, set and map
    • Insert about 5 rows into each of your tables
    • Express at least 3 update statements
      • You must perform replace, add and remove primitive operations (all of them) on columns of all collection types (all of them)
      • I.e. you must involve at least altogether 9 different primitive operations on such columns
    • Express 3 select statements
      • Use WHERE and ORDER BY clauses at least once (both of them)
      • Use ALLOW FILTERING in a query that cannot be evaluated without this instruction
    • Create at least 1 secondary index
  • Requirements:
    • Only use your own keyspace when working on the assignment
      • Name of this keyspace must be identical to your login name (f231_login)
      • Do not create this keyspace in your script (assume it already exists)
    • Do not switch to your keyspace when you are inside your script
      • I.e. do not execute a USE command to change the active keyspace from within the script
      • Specify the intended keyspace outside your script using command line options (see below)
    • Note that a different dedicated keyspace will be used when assessing your homework
      • You can assume that this keyspace will be completely empty at the beginning
  • Comments:
    • The following error messages can be ignored:
      • Error from server: code=1300 [Replica(s) failed to execute read]…
  • Submission:
    • script.cql: text file with CQL statements
  • Execution:
    • Execute the following shell command to evaluate the whole CQL script
      • cqlsh -k $KeyspaceName -f $ScriptFile
      • $KeyspaceName is a name of keyspace that should be used (must already exist), e.g. f231_login
      • $ScriptFile is a file with CQL queries to be executed, i.e. script.cql
  • Tools:
  • References:
  • Server: nosql.felk.cvut.cz
    • Do not forget to execute the homework submission script!
  • Deadline: Sunday 19. 11. 2023 until 23:59

HW5: MongoDB

  • Points: 20
  • Assignment:
    • Create a JavaScript script with a sequence of commands working with MongoDB database
    • Explicitly create 2 collections for entities of different types
      • I.e., create them using createCollection method
    • Insert about 5 documents into each one of them
      • These documents must be realistic, non-trivial, and with both embedded objects and arrays
      • Interlink the documents using references
      • Use insertOne and/or insertMany operation
    • Express 3 update operations (do not use save operation for this purpose)
      • One without update operators
      • One with at least 2 different update operators
      • One based on the upsert mode
    • Express 5 find queries (with non-trivial selections)
      • Use at least one logical operator ($and, $or, $not)
      • Use $elemMatch operator on array fields at least once
      • Use both positive and negative projections (each at least once)
      • Use sort modifier
      • Describe the real-world meaning of all your queries in comments
    • Express 1 MapReduce query (non-trivial, i.e. not easily expressed using ordinary find operation)
      • Describe its meaning, contents of intermediate key-value pairs and the final output
      • Note that reduce function must be associative, commutative, and idempotent
      • Instead of MapReduce, you can write an appropriate aggregation.
    • Express 5 aggregate operations. Use 2 created collections for entities of different types. If necessary, insert more documents into each one of them
      • Use at least once each of $match, $group, $sort, $project (or $addFields), $skip and $limit stages
      • Use at least once each of $sum (or $avg), $count, $min (or $max), $first (or $last) aggregators
      • Describe the real-world meaning of all your queries in comments
  • Requirements:
    • Call export LC_ALL=C in case you have difficulties in launching the mongo shell
    • Only use your own database when working on the assignment
      • Name of this database must be identical to your login name (f231_login)
    • Do not switch to your database when you are inside your script
      • I.e. do not execute USE database and nor db.getSiblingDB('database') commands
      • Specify the intended database outside your script using command line options (see below)
    • Note that a different dedicated database will be used when assessing your homework
      • You can assume that this database will be empty at the beginning
    • Print the output of your queries (find operations)
      • Use db.collection.find().forEach(printjson); approach for this purpose
    • Print the output of your MapReduce job using out: { inline: 1 } option
      • I.e. do not redirect the output into a standalone collection
  • Submission:
    • script.js: JavaScript script with MongoDB database commands
  • Execution: mongosh –port 42222 -u login -p password database script.js
    • Execute the following shell command to evaluate the whole MongoDB script
      • mongosh –port 42222 -u $login -p $password $database $file
      • $login is your username, e.g. f231_login
      • $database - database to connect to (same as login)
      • $password is your password (Use the same password you received for your account at the beginning of the semester)
      • $file is a file with MongoDB queries to be executed, i.e. script.js
      • Double dashes before port
  • Tools:
    • MongoDB 6.0.1 (installed on the NoSQL server)
  • References:
  • Server: nosql.felk.cvut.cz
    • Do not forget to execute the homework submission script!
  • Deadline: Sunday 10. 12. 2023 until 23:59

HW6: Neo4j

  • Points: 20
  • Assignment:
    • Insert realistic nodes and relationships into your embedded Neo4j database
      • Use a single CREATE statement for this purpose
      • Insert altogether at least 10 nodes for entities of at least 2 different types (i.e. different labels)
      • Insert altogether at least 15 relationships of at least 2 different types
      • Include properties (both for nodes and relationships)
      • Associate all your nodes with user-defined identifiers
    • Express 5 Cypher read query expressions
      • Use at least once MATCH, OPTIONAL MATCH, RETURN, WITH, WHERE, and ORDER BY (sub)clauses (all of them)
      • Aggregation in at least one query
    • Express 5 Cypher write or read/write query expressions
      • Use at least once CREATE (with MATCH), DELETE, SET, REMOVE, DETACH (sub)clauses (all of them)
  • Requirements:
    • Describe the meaning of your Cypher expressions in natural language (via // comment)
  • Submission: BRUTE and NoSQL server
    • queries.cypher: text file with a sequence of Cypher statements (including CREATE) and screenshots of execution
  • Execution:
    • Execute the following shell command to evaluate the whole Neo4j script
      • cypher-shell -f $ScriptFile
      • $ScriptFile is a file with Cypher queries to be executed, i.e. queries.cypher
  • Tools:
    • Neo4j 3.0.7 (installed on the NoSQL server)
  • References:
  • Deadline: Sunday 31. 12. 2023 until 23:59

HW7: Extra homework on MongoDB (optional)

  • Points: 10
  • Assignment:
    • Create User Interface which allows to
      • Insert new document
      • Find a document/documents under some condition
      • Update the document
      • Remove the document
    • Work with your database on our NoSQL server.
  • Further instructions see in Google document
  • Deadline: Sunday 7. 1. 2024 until 23:59

Individual Topics

  • Please, fill in your name and surname near one of the topics in the DS2 topics table or add your own topic at the bottom of the DS2 topics table.
  • Try to propose your own original topic in the first place
  • You can also get inspired by the following topics (in alphabetical order, in English and in Czech)
    • Access system, Accommodation booking, Accommodation comparator, Accommodation sharing, Agricultural production, Air rescue service, Air traffic management, Airline, Airport, Armory, Army, Artworks, Assignment submission, ATM network, Attendance system, Auction, Bakery, Bank, Bank account, Bazaar, Beekeeper, Betting shop, Beverages store, Bike sharing, Black market, Blog, Boat rental, Bookstore, Botanic garden, Brewery, Building materials store, Bus station, Bus tickets, Business register, Cadastre, Cafe, Canteens, Car rental, Car repair shop, Car showroom, Casino, Castles, Catering, Caves, Cemetery, Cinema, City tours, Classbook, Collection and disposal of waste, Collection of laws, College dorm, Computer games, Conference, Construction management, Content management system, Contract register, Convenience store, Cookbook, Cooking classes, Council meetings, Countries of the world, Courier service, Cowshed, Dance school, Deliveries, Desk games, Discussion forum, Doctor's office, Dog park, Dog shelter, Driving school, Drugs, Dump, Educational institution, Elections, Electronic prescriptions, Employee records, Empty houses, Entertainment center, Environmental center, Exhibition, Exhibition grounds, Experience donation, Fairy tales, Farmer markets, Finance manager, Financial advisory, Financial markets, Fire protection, Fishing equipment, Fitness center, Flat owners association, Fleet, Flight ticket booking, Food bank, Food distribution, Football league, Football team, Forest kindergarten, Forwarding company, Foster care, Gallery, Garden center, Gardening colony, Gas station, Glassworks, Golf clubs, Grant agency, Grid, Hair salon, Handyman, Hardware, Health insurance, High school, Highway fees, Hiking trails, Hobby market, Hockey league, Holiday offers, Horse racing, Hospital, Hotel, Housing association, Chamber of deputies, Chess club, Chess competition, Chess database, Incinerator, Industrial zone, Insurance company, Intelligence service, Intersport arena, Job offers, Jurassic park, Kindergarten, Laboratory, Labour office, Language school, Lego, Leisure activities, Library, Log book, Logistics center, Logistics company, Logistics warehouse, Lottery, Luggage storage, Manufacturing processes, Maternity hospital, Medical reimbursement, Meeting scheduling, Menu, Metro operation, Military area, Mobile operator, Mobile phones, Model trains, Morgue, Mountain rescue service, Movies, Multinational company, Multiplex network, Museum, Music festival, Music production, Musical instruments, National parks, Nature reserve, Newspaper publishing, Non-bank loans, Nuclear power plant, Nutritional values, Online exercises, Online streaming service, Orienteering, Outdoor swimming pool, Parking lot, Parts catalog, Patient medical card, Pawnshop, Payment cards, Personal documents, Personal trainer, Pharmacy, Photo album, Pizzeria, Plagiarism detection, Planning calendar, Police database, Political parties, Popular music, Population register, Post, Postal addresses, Poultry farming, Prestashop, Prison, Procurement, Project management, Property administration, Psychiatric hospital, Public greenery, Public transport, Railway network, Real estate agency, Recruitment agency, Refugee camp, Registration of sales, Regulatory fees, Research projects, Research publications, Restaurant, Restaurant reservations, Road closures, Room reservation, Scout group, Scrapyard, Security agency, Seizures, Shared travel, Shooting range, Shopping center, Ski school, Skiing area, Sobering-up cell, Social benefits, Social network, Software development, Spare parts, Sports club, Sports tournament, Stable, Statement of work, Stock exchange, Student book, Study abroad, Study materials, Study system, Subsidy programs, Summer camp, Supermarket, Sweet-shop, Swimming pool, Symphony orchestra, Tax office, Taxi service, Teahouse, Theater, Theater plays, Time tables, Tollgates, Tourism, Tourist group, Traffic accidents, Traffic control center, Train station, Transport company, Transport control, Travel agency, Trial, Truck transport, TV program, TV series, Universe, Vaccination abroad, Veterinary clinic, Video shop, Virtual tours, Visas, War conflicts, Water park, Water supply, Weapons, Weather forecast, Webhosting, Webshop, Wedding dress rental, Wholesale, Winter road cleaning, World heritage list, Zoning plan, Zoo
    • Adresní místa, Aquapark, Armáda, Aukce, Autobusové nádraží, Autosalon, Autoškola, Banka, Bankovní účet, Bazar, Bezpečnostní agentura, Blog, Botanická zahrada, Burza, Bytové družstvo, Catering, Cestovní kancelář, Cukrárna, Cvičiště pro psy, Čajovna, Černý trh, Čerpací stanice, Dálniční poplatky, Darování zážitků, Deskové hry, Detekce plagiátů, Diskuzní fórum, Divadelní hry, Divadlo, Dodávka vody, Docházkový systém, Dopravní dispečink, Dopravní nehody, Dopravní podnik, Dopravní uzavírky, Doručování zásilek, Dotační programy, Ekologické centrum, Elektronická evidence tržeb, Elektronické recepty, Evidence smluv, Evidence součástek, Evidence zaměstnanců, Exekuce, Farmářské trhy, Filmy, Finanční poradenství, Finanční trhy, Finanční úřad, Fitness centrum, Fotbalová liga, Fotbalový tým, Fotoalbum, Galerie, Golfové kluby, Grantová agentura, Hardware, Hobby market, Hodinový manžel, Hokejová liga, Horská služba, Hotel, Hrady a zámky, Hřbitov, Hudební festival, Hudební nástroje, Hudební produkce, Jaderná elektrárna, Jazyková škola, Jazykové pobyty, Jednání zastupitelstva, Jeskyně, Jídelníček, Jízdenky na autobus, Jízdní řády, Jurský park, Kadeřnický salon, Kamionová doprava, Kasino, Katastr nemovitostí, Kavárna, Kino, Kniha jízd, Knihkupectví, Knihovna, Konference, Koňské dostihy, Koupaliště, Kravín, Kuchařka, Kurýrní služba, Kurzy vaření, Laboratoř, Lékárna, Lékařská karta pacienta, Léky, Lesní školka, Letecká společnost, Letecká záchranná služba, Letiště, Letní tábor, Logistická firma, Logistické centrum, Logistický sklad, Loterie, Lyžařská škola, Lyžařský areál, Márnice, Mateřská škola, Menzy, Městská hromadná doprava, Městské exkurze, Mobilní operátor, Mobilní telefony, Modely vláčků, Multifunkční aréna, Muniční sklad, Muzeum, Mýtné brány, Nabídky dovolené, Nabídky práce, Nadnárodní společnost, Náhradní díly, Národní park, Nebankovní půjčky, Nemocnice, Nutriční hodnoty, Obchodní centrum, Obchodní rejstřík, Očkování do ciziny, Odevzdávání úkolů, Online cvičení, Online půjčovna seriálů, Ordinace lékaře, Orientační běh, Osobní doklady, Osobní trenér, Parkoviště, Pekárna, Personální agentura, Pěstounská péče, Pivovar, Pizzerie, Plánovací kalendář, Plánování schůzek, Platební karty, Plavecký bazén, Pneuservis, Počítačové hry, Pohádky, Pojišťovna, Policejní databáze, Politické strany, Populární hudba, Porodnice, Poslanecká sněmovna, Pošta, Potravinová banka, Požární ochrana, Pracovní úřad, Prázdné domy, Prestashop, Provoz metra, Průmyslová zóna, Předpověď počasí, Přepravní kontrola, Přírodní rezervace, Přístupový systém, Psí útulek, Psychiatrická léčebna, Půjčovna auta, Půjčovna lodí, Půjčovna svatebních šatů, Realitní agentura, Redakční systém, Registr obyvatel, Regulační poplatky, Restaurace, Rezervace letenek, Rezervace místností, Rezervace ubytování, Rezervace v restauraci, Rozvodná síť, Rozvoz jídla, Rybářské potřeby, Řízení leteckého provozu, Řízení projektů, Sázková kancelář, Sbírka zákonů, Sdílená kola, Sdílené cestování, Síť bankomatů, Síť multikin, Skautské středisko, Sklad nápojů, Skládka, Sklárna, Sociální dávky, Sociální síť, Soudní řízení, Spalovna, Spediční firma, Společenství vlastníků jednotek, Sportovní klub, Sportovní turnaj, Správa objektů, Správce financí, Srovnávač ubytování, Stáj, Státy světa, Stavební řízení, Stavebnice lego, Stavebniny, Střední škola, Střelnice, Studijní materiály, Studijní systém, Supermarket, Světové dědictví, Svoz a likvidace odpadů, Symfonický orchestr, Šachová databáze, Šachová soutěž, Šachový klub, Taneční škola, Taxi služba, Televizní program, Televizní seriály, Třídní kniha, Turistické cesty, Turistický oddíl, Turistický ruch, Ubytování v soukromí, Uprchlický tábor, Úschovna zavazadel, Územní plán, Válečné konflikty, Včelař, Večerka, Vědecké projekty, Vědecké publikace, Velkochov drůbeže, Velkoobchod, Veřejná zeleň, Veřejné zakázky, Vesmír, Veterinární klinika, Vězení, Videopůjčovna, Virtuální prohlídky, Víza, Vlakové nádraží, Vojenský prostor, Volby, Volnočasové aktivity, Vozový park, Vrakoviště, Vydavatelství novin, Výkaz práce, Výrobní procesy, Vysokoškolská kolej, Výstava, Výstaviště, Výtvarná díla, Vývoj softwaru, Vzdělávací instituce, Webhosting, Webový obchod, Zábavní centrum, Zahrádkářská kolonie, Zahradnictví, Záchytka, Zastavárna, Zbraně, Zdravotní pojišťovna, Zdravotní úhrady, Zemědělská výroba, Zimní úklid komunikací, Zoologická zahrada, Zpravodajská služba, Žákovská knížka, Železniční síť
  • Nevertheless, the following topics are not allowed this semester
    • Movies, actors
courses/b4m36ds2/tutorials/start.txt · Last modified: 2024/01/04 19:33 by prokoyul