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Two lines intersect at a point, forming $\angle 1, \angle 2, \angle 3$, and $\angle 4$. $\angle 1$ and $\angle 3$ are vertical angles.
$\angle 2$ and $\angle 4$ are vertical angles.
$
m \angle 1=70^{\circ}
$

What is the measure of $\angle 2$ ?
$20^{\circ}$
$70^{\circ}$
$90^{\circ}$
$110^{\circ}$