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Scheme Programming Language

(define (f a (b lazy) c (d lazy-memo))


Can nice people give examples on when is safe and unsafe to use lazy
and lazy-memo. (in the context of SICP 4.2 lazy-eval).

1. safe lazy
2. safs lazy-memo
3. unsafe lazy
4. unsafe lazy-memo

I don't know if there are many unexplored middle grounds.
All I care right now is to recognize unsafe cases, and use only safe
cases. Thanks.

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