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sol. 18. No. 1. (1, 10, U — 17 tan 2. 66. FM 6. 76. O. 84% .... 18. No. 1. (1, 10, U — 17 tan 2. 66. FM 6. 76. O. 84%, 400 321 2. 60. ( cm ) 18. 0±2. o FM • 3. 05, 35 s/a(%)

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