x                xs
0 5 9 0          0 1 | 5
0 9 0 7          0 2 | 9
0 0 0 0          1 1 | 9
                 1 3 | 7
   ^x+1
2.71828 403.429 22026.5 2.71828
2.71828 22026.5 2.71828 2980.96
2.71828 2.71828 2.71828 2.71828

   ^xs+1
0 1 | 403.429
0 2 | 22026.5
1 1 | 22026.5
1 3 | 2980.96

   (^x+1) -: ^xs+1
1