| ?- partial_functions::show.
[0,1,2,3] -> fs(f1) -> [0,2,4,6]
[0,1,2,3] -> fs(f2) -> [0,1,4,9]
[2,4,6,8] -> fs(f1) -> [4,8,12,16]
[2,4,6,8] -> fs(f2) -> [4,16,36,64]
yes