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#!/usr/bin/env perl -l

...
        }
    }
}

wantedA1
wantedA2
...
wantedB2
wantedC1
wantedC2

#!/usr/bin/env perl -l

...
        print $line;
    }
}

lineA
wantedA1
...
lineC
wantedC1
wantedC2