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- EXECUTION MODEL
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- After having read a line through readln, we want to interpret
- it. As a general rule, we go like this:
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- 1. read single word from line
- 2. Can we find the word in dict?
- 3. If yes, execute that word, goto 1
- 4. Is it a number?
- 5. If yes, push that number to PS, goto 1
- 6. Error: undefined word.
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