Fill in the powers of x and y to make the equation true.

$\displaystyle{{\left({{x}}^{{2}}{{y}}^{{-{{4}}}}{{\left({{x}}^{{-{{2}}}}{{y}}^{{4}}\right)}}^{{-{{3}}}}\right)}}^{{2}}={{x}}^{?}{{y}}^{?}\usepackage{cmbright}\Huge\$

Exponents may be positive, negative, or 0.