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What is the first step in the construction of a line perpendicular to AB←→ and passing through an external point M? Assume that the construction uses only a compass and a straightedge. Place the compass needle on M and, keeping the compass width the same, draw two arcs that intersect AB←→. Place the compass needle at any point on AB←→, and set the compass width to M. Draw a line from point M passing through AB←→, and mark the point of intersection. Place the compass needle at any two points on AB←→, and draw two arcs through M.

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