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triangulate (x:a:b:xs) = scanl (curry (snd *** id)) (a, b) xs
main = print $ triangulate $ [1, 2, 3, 4, 5]

Compilation error #stdin compilation error #stdout 0s 0KB

stdin

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Standard input is empty

compilation info

[1 of 1] Compiling Main             ( prog.hs, prog.o )

prog.hs:1:43: Not in scope: `***'

stdout

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Standard output is empty

https://ideone.com/yzxYG

language:

Haskell (ghc 8.4.4)

created:

visibility:

public

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