Number Distancing Problem Description Consider 9 natural numbers arranged in a 3x3 matrix: n11 n12 n13 n21 n22 n23 n31 n32 n33 Define numbers in contact with a given number to be those that appear closest to it on the same row, column or diagonally across: Contacts of number n11:n12 n22 and n21 Contacts of number n12: n11, n21, n22, n23, n13 Contacts of number n 13. n 12 n22, n23 Contacts of number n 21: n11, n12, n22, n32, n31 Contacts of number n22 n11 n12 n13, n23, n33, n32 n31, n21 Contacts of number n23: n13, n12, n22 n32, n33
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