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1. 3p^2 - 5pq + 2q^2 + 6pq - q^2 + pq is a .
 
2. The degree of 6x^7 - 7x^3 + 4 is .
 
3. If p(x) and q(x) are two expressions of degree 3, then the degree of p(x) + q(x) is .