I know, let's set on a daily basis. We have seen and are familiar with the allocation of different things. The look-alike The group is the same Or may be different, but there are some common characteristics and then some. We use words In the same group, or a group of these objects, such as the (teachers, ministers, silicate), Herd (monkeys, birds, fish) groups (housewives, politicians, soldiers, etc.) is a set of definitions. Do not be described in math, we use the term "set (Set)" only one in the group of things and to take the case to know for sure what is in and what is not. The group discussed
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