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#!/usr/bin/perl

...
a1b3c a1b4c a2b3c a2b4c
/ab/ef/ij/kl /ab/ef/ij/mn /ab/ef/ij /ab/gh/ij/kl /ab/gh/ij/mn /ab/gh/i
+j /cd/ef/ij/kl /cd/ef/ij/mn /cd/ef/ij /cd/gh/ij/kl /cd/gh/ij/mn /cd/g
+h/ij
abdel abdelmn abdelmo abdfgkl abdfgklmn abdfgklmo abdfghkl abdfghklmn 
+abdfghklmo abdfgijkl abdfgijklmn abdfgijklmo acdel acdelmn acdelmo ac
+dfgkl acdfgklmn acdfgklmo acdfghkl acdfghklmn acdfghklmo acdfgijkl ac
+dfgijklmn acdfgijklmo

aVb aWb aXXb aYb aZb  =>
(      fast)  a{V,W,XX,Y,Z}b
...
(      fast)  a{b,c}d{e,fg{,h,ij}k}l{,m{n,o}}

SUCCESS !!