Ha General works
Hb Theoretical computer science
Hc Computer engineering
Hd Computer networks
Hf Practical computer science
Hg Operating systemsHh Programming languages
Hk Databases
Hl Information systems
Hm Application software
Hn Computer graphics. Animation
Ho Multimedia. Virtual world. Cyberspace
Hp Artificial intelligence
Hr Engineering informatics
Ht Media informatics
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