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(1)611-31 = (2)890-870 = (3)516-191= (4)808-38=
(5)967-702= (6)316-210 = (7)483-465= (8)840-479=
(9)914-775 = (10)933-137 = (11)912-894= (12)838-688=
(13)27 + 46 = (14)810 - 125 = (15)92 + 65 = (16)90 + 47 =
(17)18 + 15 = (18)18 + 53 = (19)29 + 32 = (20)398 - 148 =
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