4ab, -ab+5ab, +2xy-xz, +2xy-xz, +9b, -3b+12b, 0, -3xy+4xy-xy, 8abc, 3abc-(-4abc)+abc, 15ab, 4ab-(-23ab)+(-12ab), 12xz, +7xz-12xz+14xz+3xz, 5y, (-2y)-(-3y)+(4y), 10a-10ab, -2a+5ab+12a-15ab, -5bc, -bc+14bc-17bc-bc, -1/4ab, -1/2ab+1/4ab, -1/12xy, +2/3 xy-3/4xy, -1/12c, -5/6c+3/4c, +5/18xy, 4/9xy-1/6xy, -8x, -7x -x, -8y, (-2y)-(+6y)

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