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  1. or download this
    $i-$l+1
  2. or download this
    # Start of match in first string
# End of match in first string
[ $i-$l+1, $i+1 ]
  3. or download this
    # Start of match in first string
# End of match in first string
# Start of match in second string
# End of match in second string
[ $i-$l+1, $i+1, $j-$l+1, $j+1 ]
  4. or download this
    # Start of match in first string
# Start of match in second string
# Length of match
[ $i-$l+1, $j-$l+1, $l ]
  5. or download this
    map { substr($s, $_, $best_l) }