:
Type 1- FG Left wall
Type 2- FG Right wall
Type 5- BG Left wall
Type 6- BG Right wall
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Those are wrong, I'm pretty sure. There are not specific types of walls for each side.
I've seen Type 2 on the left side as well. I've found out that it is a normal wall, which is the reason for Abe continously falling over when it's used as a floor. It's because the game thinks he's hitting a wall over and over.
Type 1 again is a wall, but it forces the player to crouch, if possible, to go underneath it. Hence why it is seen on two sides again.
Type 5 and 6 are probably the same but for the background, otherwise idk.