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| join <( tr A-Z a-z < $1 | tr -s '[:space:][:punct:]' '\n' | sort | uniq -c | awk '{print $2, $1}' ) <( tr A-Z a-z < $2 | tr -s '[:space:][:punct:]' '\n' | sort | uniq -c | awk '{print $2, $1}' ) | awk -v n=${3:-1} '{if ($2 >= n && $3 >= n) print $1}' |
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