9376/favorites' > b.txt


curl -sS 'https://www.derpibooru.org/images/2169377/favorites' > a.txt


grep '/profiles/[^"]*' a.txt b.txt -h  -o | sort -u  | wc
    583     583   12403


grep '/profiles/[^"]*' a.txt  -h  -o | sort -u  | wc
    278     278    5979


grep '/profiles/[^"]*' b.txt  -h  -o | sort -u  | wc
    543     543   11549


echo $((583 - 543))
40