I know AC solutions that for two or more of the following tests answer 1 (but different solutions answer 1 for different tests).

In all following tests there are two bricks differing in only one side. Answer for all tests is 2. It is very important that all 6 tests should be included in the test set because different wrong solutions may make different mistakes. Wrong solutions answer 1 instead of 2 for several of these tests.

2
ABCGRS
ABCGRV

2
ABCGRS
ABCGVS

2
ABCGRS
ABCVRS

2
ABCGRS
ABVGRS

2
ABCGRS
AVCGRS

2
ABCGRS
VBCGRS