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 · = 2 zrh JS = 2zrh+2zr2 = zr2h = 2zx5x3=30z JS = 30m + (2 x z x 52) = 30m + 50m = z x 52 x 3=75z = 2zx3x5 = 30m JS = (2 x z x 32) = 48m

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