looking at the pictures again, I think I spotted the other potential entry/exit on the opposite side of where I thought the exit would be.
arrow in this pic points to what I believe is a black ramp
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arrow in this pic is the direction in which the ramp looks like it goes before turning into the building.
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personally, I think zig-zags would be used as an entrance to the house with the exit being a straight away ramp down the back side.