ba8ec1910bf2 ^
1 2 3 4 5
[ (builtins.foldl' builtins.add 0 [1 2 3]) (builtins.foldl' (l1: l2: l1 ++ l2) [0] [[1] [2 3]]) (builtins.foldl' (x: y: if x == 0 then y else x * y) 0 [1 2]) ]