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222222222222222

xxix23=XXIX23nxnnsex

27 XXVII, 28 XXVIII, 29 XXIX, 30 XXXXIVI=1V=5IV=4VI=6X=10L=50C=100D=500M=1000XV罗马数字I, 1 II, 2 III, 3 IV, 4 V, 5 VI, 6 VII, 7 VIII, 8 IX, 9 X, 10 XI, 11 XII, 12 XIII, 13 XIV, 14 XV, 15 XVI, 16 XVII, 17 XVIII, 18 XIX, 19 XX, 20。

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