Count of circles in a number aka 2581 by @tttttanaka

>~:68*-:8-!#v_:::6-*\9-*!#v_:0\`#v_
^   p20+2g20<  p20-1g20   <>0#$2#<g.::1+%,002p
\x00

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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