a   b   i  x                   y
pan pan 1  0.3467901443380824  1
eks pan 2  0.7586799647899636  2
wye wye 3  0.20460330576630303 6
eks wye 4  0.38139939387114097 24
wye pan 5  0.5732889198020006  120
zee pan 6  0.5271261600918548  720
eks zee 7  0.6117840605678454  5040
zee wye 8  0.5985540091064224  40320
hat wye 9  0.03144187646093577 362880
pan wye 10 0.5026260055412137  3628800
