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12.5. Z-

, . , , , , . z,

(12.17)

z, z.

, - - z (. 12.9):

(12.18)

(12.19)

m .

. 12.10 - -. -. - m (. . - . -

. , - z

. 12.9. p- () z- ()

. 12.10. p- z-

. . z-, .

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