Words with lexical meaning do not express things, symbols, actions, but the concept of them. A concept is a general reflection of a thing-event, sign, action in the objective existence in the mind of a person. The concept summarizes the characteristics characteristic of one type of thing-phenomenon. For example, the concept of a tree, a mountain, a stone combines the common features of all mountains, stones and trees. In fact, there are many types of trees in existence, the amount of which is incalculable. The word "tree" does not refer to one of them, but expresses the general concept of this subject.

Perfect, useful, different, aid, type, facilities

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