$ perl single.pl AAAAADDDDDEFFGMMSSTVVVVV
AAAA;ADEF;DDDD;FGMS;MSTV;VVVV

$ perl single.pl AADDDEEEEFFFFGGMMMMMMMMMMSTV
ADEF;DEFG;EFGM;MMMM;MSTV

$ perl single.pl AAAADDDDEEEEFFFFGGGG
AAAA;DDDD;EEEE;FFFF;GGGG