Structure and Interpretation of Computer Programs (SICP) is a classic textbook for learning how to program. The language used in the book is Scheme, a dialect of Lisp.
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(Scheme) [SICP ex. 2.40] unique-pairs
From the section called Nested Mappings
Exercise 2.40. Define a procedure
unique-pairs that, given an integer n,
generates the sequence of pairs (i,j)
with 1< j< i< n. Use ...
