Simplify the given expression.

(v5t6)4(v6t6)3(vt5v2)6\displaystyle \frac{{{\left({v}^{{5}}{t}^{{6}}\right)}^{{4}}{\left(-{v}^{{6}}{t}^{{6}}\right)}^{{3}}}}{{\left(-{v}{t}^{{5}}{v}^{{2}}\right)}^{{6}}} =\displaystyle =