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BELL SYSTEM TECHNICAL JOURNAL 



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TOTAL TRUNKS IN MULTIPLES OF (x + y) 



Fig. 12 — Graded multiple efficiency, x + y = 10. P = 0.001. 



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TOTAL TRUNKS IN MULTIPLES OF (X + y) 



Fig. 13— Graded multiple efficiency, x + y = 20. P = 0.001. 



