1 with 9………so easy to see here that 1 has 2 empty spaces and 9 has only one each filling the gaps in the other.
2 with 6…….. this one is empty of full. (Also number 5)
3 with 4…….. again one full line and two empty spaces versus one full line and two empty spaces.
7 with 8……. Two tops lines one empty bottom and vice versa here.
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