Dominoes spots from one to six are generally arranged as they are on six-sided dice, but because blank ends having no spots are used, seven faces are possible, allowing 28 unique pieces in a double-six set. However, this is a relatively small number especially when playing with more than four people, so many domino sets are "extended" by introducing ends with greater numbers of spots, which increases the number of unique combinations of ends and thus of pieces. Each progressively larger set increases the maximum number of pips on an end by three, so the common extended sets are double-nine, double-12,
Double standard Double standard A double standard is the application of different sets of principles for similar situations. It is most commonly seen as a decisive psychological tool used to defend one’s ego or subconscious from the shortcomings of one’s own set of values or contrasting principles. It is the employment of a hypocritical and biased standpoint, with which to separate the seemingly bad in others from the bad in oneself by having two sets of rules for the same concept. Margaret Eichler, author of "The Double Standard," explains that a double standard “implies that two things which are the same are