A.1 B.1.234 C.2 D.2.34
A.3 B.5 C.6 D.8
A.1 B.2 C.3 D.6
A.’defgabc’ B.’cdefgab’ C.’efgabcd’ D.’fgabcde’
A.{1,2,3,3} B.{1,2} C.{4,5,6} D.{1,2,3}