.
N=1, =1 =1 ( . 1.18, ). , (. 1.18, ). , : , , , ; , , , . . , , . 1.18, , , .
N=2 ( ), =3, =0, . . . 1.19, ( ), . 1.19, , ( ). . 1.20, ( ), . 1.20, (- ). - : , , . 1.21
.
N=3, , . 1.22 (=4, =1, W=3×3-2×4-1=0), (W=3×3-2×3-3=0), (W=3×3-2×2-5=0); .
(N=4) 6 , , , . 1.23, . (=6, =0, W=3×4-2×6=0). , , . 1.23, . . 1.23, .
..
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