S -> AbDAB | aB
A -> ϵ | Bb
B -> ϵ
D -> f

FIRST
-----
S   A   ba  |   ab
A   B   b   |   b
B           |
D       f   |   f

FOLLOW
------
S   #                           | #         | #
A   b,FIRST(B),FOLLOW(S)        | b     S   | #b
B   FOLLOW(S),b                 | b     S   | #b
D   FIRST(A),FIRST(B),FOLLOW(S) | b     S   | #b

    a           b           f           #
S   (aB,2)      (AbDAB,1)
                (AbDAB,1)
A               (ϵ,3)                   (ϵ,3)
                (Bb,4)
B               (ϵ,5)                   (ϵ,5)
D                           (f,6)
D                           (f,6)



S -> aAaAA  | BbBAB
A -> eA     | ϵ
B -> fBA    | ϵ

    a           b           e       f           #
S   (aAaAA,1)   (BbBAB,2)           (BbBAB,2)
A                           (eA,3)
    (ϵ,4)       (ϵ,4)       (ϵ,4)   (ϵ,4)       (ϵ,4)
B                                   (fBA,5)
                (ϵ,6)       (ϵ,6)   (ϵ,6)       (ϵ,6)

FOLLOW
----------
S   #
A   a,FIRST(A),FOLLOW(S),FIRST(B),FOLLOW(B)
B   b,FIRST(A),FIRST(B),FOLLOW(S)

S   #           | #
A   aef     SB  | abef#
B   bef     S   | bef#

FIRST
------
S   ab  B   | abf
A   e       | e
B   f       | f