For $16x^{5}y^{4}$, we have $2 \times 2 \times 2 \times 2 \times x \times x \times x \times x \times x \times y \times y \times y \times y$.
For $8x^{6}y^{3}$, we have $2 \times 2 \times 2 \times x \times x \times x \times x \times x \times x \times y \times y
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