$$xy^{2}-x^{3}y^{4}$$
$xy^{2}\left(-xy-1\right)\left(xy-1\right)$
$$xy^{2}\left(1-x^{2}y^{2}\right)$$
$$\left(1+xy\right)\left(1-xy\right)$$
$$\left(xy+1\right)\left(-xy+1\right)$$
$$xy^{2}\left(xy+1\right)\left(-xy+1\right)$$
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$xy^{2}\left(1-\left(xy\right)^{2}\right)$
