Math

Pairs at Distance One or Ten

Difficulty
xxxxxxxx xxx xxx \(\{x,x,x,\xxxxx,xx\}\). xx xxx xxxx xxxx xxx xx xx xxxxxxxxxxx xxxx \(xx\) xxxxxxxx xxxxxxxxx xxxxx xxxx xxxx xxxxx xxxx \((x,x)\) xxxxxxxxx \(\xxxxx x-x\xxxxx\xx\{x,xx\}\)?

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