0-6is valid, as is any other single domino0-6 6-0is not valid, there is only one0-6domino in a set6-6 6-5 5-3 3-0is valid, a simple linear arrangement6-6 6-5 3-0 5-3is not valid, there is no3or0in play for the third domino to connect to prior to the5-3being played1-1 1-2 1-3 1-4 1-5 1-6is not valid, all four open1ends are used up leaving nowhere to connect the1-61-1 1-2 1-3 1-4 1-5 3-6 1-6is valid, the 3-6 connects to the 1-3, then the 1-6 can connect to the 3-65-5 5-4 5-0 0-6 6-6 6-4 6-2 2-1 6-3 5-1 1-1 1-6 4-1 1-0 0-0 2-0 3-0 0-4is valid, the above illustrated example- '12-12 12-1 3-12 3-1 1-2 3-3`
12-12 12-1 3-12 3-1 1-2 3-3is valid, uses larger dominoes, and has an ambiguous placement
