How do I get inside the room to the west?

When you're a fly it's pretty easy, since you're very tiny.

All you need to do is fly through the security card slot.

As a human, it's a little more difficult.  I hope you remember what you saw
as a fly.

You must remember those beams of light in the slot.

You should have noticed that walking through some of them triggered part of
the lock, but that other beams didn't.

You want to create a security card that opens all of the locks at the same
time, but that doesn't also block any of the other beams.

You already have another sort of card that will do the trick.

And an item that will create the holes for you.