one fable-low hijack cell
pair Lisp / ambiguity
envelope en_arrow
ordering BA
effort low
English with arrow '→' — '{X} → {Y}'
verdictpicked ambiguity (second-offered)
· classifierB
· tiernone
response (200 chars)
You're pointing at **`amb`** — McCarthy's ambiguous operator (1961), one of Lisp's most elegant ideas.
## The idea
`(amb a b c)` "ambiguously" returns one of its arguments — specifically, *whichever
neighbors