D c2 ab

D c2 abD c2 abD c2 abD c2 abD c2 abD c2 ab
D c2 abD c2 abD c2 abD c2 abD c2 abD c2 ab
D c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 abD c2 ab