1 Your oranges should be washed before peeling or cutting. Wet each orange with water, rub its surface, rinse it with running water and dry it with a clean towel.  Washing oranges in a sink filled with water is not recommended since the standing water can spread contamination from one orange to another. The use of soap or detergent is not recommended because the fruit can absorb detergent residues. Consider a dip in clear white vinegar as an added precaution.
The most common domino sets commercially available are double six (with 28 tiles) and double nine (with 55 tiles). Larger sets exist and are popular for games involving several players or for players looking for long domino games. The number of tiles in a set has the formula 12(n + 1)(n + 2) for a double-n set.
Two teams of two players acting as partners play Cuban dominoes. There are three standard games: 100, 150, or the longest version, which is 200 points. The most popular game is played to 150 points. The two teams usually play three sets -- whoever wins two games out of three wins the match. The fichas, or tiles, are placed face down on the domino table. One player mixes up the tiles by sliding them around randomly. Once shuffled, each player takes 10 dominoes each (40 in total), leaving 15 pieces aside. Each player places the 10 dominoes in his hand on edge facing away from the other players so that only the player can see them. Some domino tables have special channels or a raised edge to help keep the hand upright.