5a, a+a+2a+a, 3a+2, 4a-a+2, 2ef+e+f, ef+fe+f+e, 11e+11f, 4f+3e+7f+8e, 2a+2b, 5a-6b-3a+8b, p+q+3r, p+2q+r-q+2r, 3p+2q+pq, 3p+2pq+2q-pq, -a-b, 3a-2b-4a+b, 9e-7f, 7e-5f+2e-2f, r-3q, p-q+r-2q-p.

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