Creating Minimal Subgroups in a List of Characters

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__DATA__
0024.118.3A F T TFF     
...
0024FT containing 0024.118.3A,B,C,D  TFF
0024FF containing 0024.118.4         TFF (coincidently)
the degree causes the change in grouping

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__DATA__
0039.04    N N OTH
...
0039NN       containing 0039.04    OTH
0039.205.2FT containing 0039.205.2 OTH
0039FT       containing 0039.205.6 TFF

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#! usr/bin/perl
# Compiler directives and Includes
...
409.176.12C FT TFF
409.176.12D FT OTH
409.176.12E FT OTH

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