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PS changes in 2003
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- Split into one frame file per lecture
- Replaced "Pascal" by "C" wherever possible
C
- :: is not C!!!
- pointers to books on C style & efficiency
- string "hello world\n" is 14 not 13 chars
- add something on structs? (C++ object encodings?)
- remove/move to end/extras:
  - built-in data types
Types
- add inference of length before map
- move type inference later; start with type constructors earlier
- add question == for Tree
Lambda
- added slide on parsing; simplified various expressions
Prolog
- deprecated bncf and lambda interpreters
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