xtr -f char s/4/for s/3/e s/7/l s/D/d;
*** Error in `xtr': corrupted double-linked list: 0x085a0228 ***

Occurs only after a fourth swap declaration? What kind of horse-shit is that? Given the same operation, regardless of input flag error on fourth term??? What is this an american presidency?

*** Error in `presidency': your fucking term is almost over asshole: 0x085a0228 ***

I'm not fucking amused. The logic was sound when I wrote it and clearly functions properly untill you add a fourth statement to the list That is not a logical error. None of the functions have anything to do with the number four or the number three or the number 5!