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Primary school mathematics exclusion method
Solution: From the first cube, we can know that the numbers of two adjacent faces of 1 are 4 and 6 respectively.

As can be seen from the second cube, the numbers of two adjacent faces of 1 are 2 and 3 respectively.

From this, we can see that there are numbers around 1, which are 2, 3, 4 and 6 respectively. Therefore, we can see that 2 and 3 may be in the lower left of the first picture. From the third picture, we can see that 3 and 4 are adjacent, so we can see that 3 should be on the lower side of the first picture and 2 should be on the left side of the first picture.

Existing: 4 and 2, 6 and 3, 1 and 5 are opposite.