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.
Rules for Dominoes. There are a variety of types of domino sets in use all over the world and a great number of games that can be played with them. Following are the rules for the two most commonly played games in the West - the standard or block game and the draw game. The instructions describe the games played with the standard or double-six domino set comprising 28 tiles, but the games can be played with a double-nine or a double-twelve set.