29) D

Starting from left to right on each row, let us label each of the tiles. 
A                    B                          C                             D
E                    F                          G                              H
I                     J                          K                               L
1. A is unique
2. B is similar to F and H
3. C is similar to E and G
4. D is unique
5. I is similar to J
6. K is unique
7. L is unique
So there are 7 different patterns. So D is the answer.

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