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  1. or download this
    the quick brown fox
brownbrownbrownbrown
..........00000.....
  2. or download this
    xxxyyxxy
yyyxyxxyyyxyxx
...
abcdefga
abcdefgabcdefg
00000000...... False match
  3. or download this
    sub lcssN (\$\$;$) {
    my( $ref1, $ref2, $min ) = @_;
...
    return unless $match[ 0 ];
    return wantarray ? @match : $match[ 0 ];
}
  4. or download this
    sub lcssN (\$\$;$) {
    my( $ref1, $ref2, $min ) = @_;
...
    return unless $match[ 0 ];
    return wantarray ? @match : $match[ 0 ];
}