A domino storage box will fit 6 half dominoes across by 6 half dominoes wide.
Put the following dominoes in the box, numbers up, such that the sum of each row and column totals 14.

(0,0) (1,0) (1,1) (2,0) (2,1) (2,2) (3,0) (3,1) (3,2) (4,1) (4,2) (4,4) (5,1) (5,2) (6,0) (6,1) (6,4) (6,5)