Removing lines in L-shaped hole in floor

My plan says there must be an L-shaped opening above the stairs to the second floor.

I made the L shape by drawing 2 rectangular openings in the floor. How do I delete those 2 lines that you see separating the 2 rectangles?

Peter Enns


Stairs to 2nd Floor.skp (370.6 KB)

Because they are not single edges:

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