What is the greatest common factor of $\displaystyle{4}{{x}}^{{2}}{{y}}^{{3}}{{z}}^{{2}}\usepackage{cmbright}\Huge\$ , $\displaystyle{8}{{x}}^{{3}}{{y}}^{{2}}{{z}}^{{2}}\usepackage{cmbright}\Huge\$ , and $\displaystyle{10}{{x}}^{{3}}{y}{{z}}^{{3}}\usepackage{cmbright}\Huge\$ ?