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=27p^{3}-18p^{2}q+12pq^{2}+18p^{2}q-12pq^{2}+8q^{3}
=27p^{3}-18p^{2}q+18p^{2}q+12pq^{2}-12pq^{2}+8q^{3}
=27p^{3}+8q^{3} (a)