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LL Golf Hole 4 - 文章から単語の索引を作る (Nested Flatten)
awk -f word.awk gpl.txt
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{gsub(/[^a-zA-Z0-9]/, " ");for(i=1;i<=NF;i++)t[$i]=t[$i]":"NR}
END{for(k in t)print k t[k]}

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