9+3< X < 7+7, 13, 9+X=13, 4, 8+X=11, 3, X+7=12, 5, 15kisebb szomszédja, 14, 8,10,12,..., 14,16,18, 11,13,15,..., 17,19,21, 20,17,14,..., 11,8,5.

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