0     3     "abcdef" str .infix   dump
3     6     "abcdef" str .infix   dump
0     2 neg "abcdef" str .infix   dump
2 neg 6     "abcdef" str .infix   dump
3 neg 1 neg "abcdef" str .infix   dump
2     0     "abcdef" str .infix   dump
2 neg       "abcdef" str .postfix dump
2           "abcdef" str .prefix  dump