4918
5880
3万
GROAD
曲径通幽,安觅芳踪。
# echo "akoqaaboooozkk" | sed 's/[^\n]/&\n/g' | sed '/^$/d' | sort | uniq -c 3 a 1 b 3 k 5 o 1 q 1 z
# echo "akoqaaboooozkk" | sed 's/[^\n]/&\n/g' | sed '/^$/d' | sort | uniq -c | tr -d ' \n' 3a1b3k5o1q1z
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