6 frames, pattern EABCDE, source frames zabcd

Frame 17 (E) Fields [z][z]

Frame 18 (A) Fields [za][a]

Frame 19 (B) Fields [ab][b]

Frame 20 (C) Fields [b][bc]

Frame 21 (D) Fields [c][cd]

Frame 22 (E) Fields [d][d]