One arrangement of dominoes is shown above where 0 is blank and the other numbers are the number of pips on the domino faces. Horizontal, vertical and diagonal sums come to 6 pips. The arrangement of dominoes can be changed as long as the pips are in the same position. The one shown uses 3 blank-1, 3 2-3, blank-3 and 1-2; by changing the two central dominoes we have 4 blank-1 and 4 2-3 dominoes.