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Thu Aug 9 14:34:52 CEST 2007

reduce

transforming

((a . 1) (a . 2) (a . 3)
 (b . 4) (b . 5))

into

((a . (1 2 3))
 (b . (4 5)))

is called 'reduce', at least that's what i recall... but, i think
maybe the more general 'fold' is also called reduce sometimes.. so i'm
going to call it 'collect' for now.

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