56.20 !?5.30 54.5753.32 51.60 49.40 47.09 42.06 1.07 1.95 3.30 4.2"9 5.64 6.75 7.48 8.24 9.60 10.86 12.04 13.04 14.47 15.17 16.21 17.46 18.44 19.98 20.66 21.49 22.48 23.50 24.23 25.77 26.63 27.37 28.33 29.43 30.44 31.9233 .1734.37 35.35 36.81 38.01 39.08 40.43 41.41 42.53 43.80 44.70 45.43 46.68 48.40 50.60 52.91 57.
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F. M. Van Tuyl (1916) studied this question.
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