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15.13.

[Boris, 1970]. [Palevsky, 1980] . [Godfrey] . (. 14.10-14.12) .

, 14.10, , . (14.69) ,

, . (. . 14.18)

(. 15.12).

(. 15.13)

(. 15.14).

, , . ,

-.

, 14.10, . : 14.12 , . - , () (15.25) () . [Hewett, 1983].

(. )

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