(The title says it all)
One x Two
Three x Four
Five x Seven
Six x Eight
Nine x Ten
Eleven x Twelve
Thirteen x Fourteen
Fifteen is still single :(
Sixteen x Eighteen
Seventeen is still single :(
Nineteen is single :(
Twenty is single :(

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Numberblocks (human AU)
FanficBasically,they are all humans. Yes,they can travel between Numberland and the human world. And they still have the ability to combine and all that.