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perpendicular lines and intersecting lines
are perpendicular lines intersecting lines
perpendicular lines vs intersecting lines
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perpendicular intersecting and parallel lines
can intersecting lines be perpendicular
intersecting but not perpendicular lines
intersecting parallel perpendicular lines
perpendicular lines and intersecting lines, are perpendicular lines intersecting lines, perpendicular lines vs intersecting lines, intersecting lines perpendicular lines, perpendicular intersecting and parallel lines, can intersecting lines be perpendicular, intersecting but not perpendicular lines, intersecting parallel perpendicular lines
