24 since there's (3 choose 2 = 6) triangles for the top part and then that times 4 for the ability to extend that down 1,2,3, or 4 rows.
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24 since there's (3 choose 2 = 6) triangles for the top part and then that times 4 for the ability to extend that down 1,2,3, or 4 rows.