How can I attach 2 Billy bookcases?


Hello everyone. I ordered 4 Billy bookcases to make my walk-in dressing. I want to attach them 2 by 2, one in front of the other so I have a 2 wardrobe units depth 22 inches. The Billy bookcases are 11 inches. The one behind, against the wall, I will fasten to the wall like it should be. But the ones in front?

Thanks already.

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