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my (@chunks, @fbits, @lbits);
.....
...
push @$chunks, [ (bits2num( [ @prefix, (split //, '0' x $size) ])), @$
+fbits - $size ];
}
}

if ($idx2 >= $idx1)
{
...
do_chunk ($chunks, $fbits, [ @prefix, (split //, '0' . '1' x $size) ])
+;
do_chunk ($chunks, [ @prefix, (split //, '1' . '0' x $size) ], $lbits)
+;
}