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#!/usr/bin/env bash
cat -- "${@:-/dev/stdin}" |
while read -r -a ws ; do
for w in "${ws[@]}" ; do
w=${w%%[^a-zA-Z]*}
w=${w##*[^a-zA-Z]}
[[ $w ]] || continue
printf '%s\n' "$w"
done
done | tr '[:upper:]' '[:lower:]'
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