find wikipedia -type f -exec cat {} ; | grep -v "<" > concat1.txt

cat concat1.txt | jq -Rr 'fromjson? | .text' > concat1-text.txt

tr '[:upper:]' '[:lower:]' < concat1-text.txt > concat1-lowercase.txt

cat concat1-lowercase.txt | sed -e 's/[^a-zA-Z*0-9]/ /g;s/ / /g' | tr " " "\n" | sed '/^\s$/d' > concat1-words.txt

sort --parallel=32 -uo concat1-dedupe.txt concat1-words.txt