Evaluate
\left(-2m+2n-1\right)\left(m-n\right)^{4}
Expand
-2m^{5}-m^{4}+20m^{2}n^{3}-10mn^{4}+4mn^{3}+2n^{5}-n^{4}-20n^{2}m^{3}+10nm^{4}+4nm^{3}-6\left(mn\right)^{2}
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