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1) pr + qr – ps – qs
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2) 3ax – bx –3ay + by
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3) a^{2} + 3a + ac + 3c
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4) ax^{2 }+ 2ax – bx – 2b
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5) 2x + cx + 2c + c^{2}
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6) 6x^{2} + 3xy – 2ax – ay
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7) 2m – 2n + mx – nx
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8) x^{3} – x^{2}y^{2 }– y^{3} + xy
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9) ab – bc + ad – cd
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10) ad + bc + ac + bd
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