A
2
bAb
2
A
3
bAb
3
A
4
bAb
4
A
5
bAb
5
2 1 1 2
3 1 1 3
4 1 1 4
5 1 1 5
A
2
bAb
2
A
3
bAb
3
A
4
bAb
4
(2,2) (2,2)
(3,2) (3,2)
(3,3) (3,3)
Palindromic BFRs derived from AbAb.
A2bAb2
A3bAb3
A4bAb4
A5bAb5
2 1 1 2
3 1 1 3
4 1 1 4
5 1 1 5
A2bAb2
A3bAb3
A4bAb4
(2,2) (2,2)
(3,2) (3,2)
(3,3) (3,3)