48 Sequentially Numbered Labels for Clothing

How to pair socks from a pile efficiently?
At least one sock seems to disappear with every wash, leaving you with a pile of lonely items that have lost their other half. Don't despair. We found the solution. Just give each pair of socks an unique number inside of the board. Now, after washing, iterate over the socks in your input basket, pick one from each pair and find the other half having the same number. Easy !

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