107 + 152, 222 + 233, 345 + 322, 414 + 453, 500 + 500, 699 + 650, 7007 + 7122, 8111 + 8321, 9991 + 9852 - 19,843, 1009 + 1150, 998 - 950, 890 - 85, 779 - 755, 649 - 629, 589 - 582, 498 - 479, 323 - 313, 229 - 203, 166 - 142, 2589 - 2223,

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