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I have a collection of LEGO sets, from which only the B model is assembled and the remaining pieces have been lost.

What is the easiest way to figure out which pieces are missing from these sets?

4

You can use the Compare Sets function on Rebrickable for that (if the B model is an official model or a MOC on Rebrickable).

Here an example for both official models from the 42069 set.

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