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. , , . , , : (Bailey, 1975; Everitt, 1980; Lorr, 1983). . (1971), , (1979), . , , : (Anderberg, 1973; Clifford and Stephenson, 1975; Hartigan, 1975; Mezzich and Solomon, 1980; Sneath and Socal, 1973).

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