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use strict;
use warnings;
...
BLABLABLA 2 BLABLA
BLABLALBA 3 BLABLA
BLABLABLA 3 BLABLA

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strings for class 2:
        BLABLABLA 2 BLABLA
...
strings for class 3:
        BLABLALBA 3 BLABLA
        BLABLABLA 3 BLABLA