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In the diagram, the measure of angle 3 is 89°, and the measure of angle 6 is 88°.

A transversal intersects 2 lines to form 8 angles. Clockwise from the top left, the angles are 1, 2, 3, 4; 5, 6, 7, 8.

What is the measure of angle 4?
88°
89°
91°
92°