S -> Abc | Bd | d

FIRST(A) = {a,b}
FIRST(B) = {c}

        a       b       c       d       #
S       (Abc,1) (Abc,1)         (d,3)
A
B
a
b
c
d
#



S -> Ab
A -> ϵ

FIRST

S   b
A

FOLLOW



    b       #
S   (Ab,1)
A   (ϵ,2)
b
#


S -> aBcd | AB
A -> ϵ | bB
B -> ϵ

    a           b           c       d       #
S   (aBcd,1)    (AB,2)                      (AB,2)
A               (bB,4)                      (ϵ,3)
B                           (ϵ,5)           (ϵ,5)


FIRST

S   aAB     ab
A   b       b
B

FOLLOW

S   #                           #
A   FIRST(B), FOLLOW(S)         #
B   c, FOLLOW(S), FOLLOW(A)     c#

------------------------------------------------------

S -> Bd   | dd
A -> a    | cA
B -> ABCd | bc
C -> AB   | ϵ

    a       b       c       d       #
S   (Bd,1)  (Bd,1)  (Bd,1)  (dd,2)
A   (a,3)           (cA,4)
B   (ABCd,5)(bc,6)  (ABCd,5)
C   (AB,7)          (AB,7)  (ϵ,8)

FOLLOW
------
S   #                       #
A   FOLLOW(A),FIRST(B)      abc
B   d,FIRST(C),FOLLOW(C)    acd
C   d                       d

FIRST
-----
S d  B | abcd
A ac   | ac
B b  A | abc
C    A | ac

-------------------------------------------------

                    FIRST           FOLLOW
S -> CADB | D       CD      | ab    #
A -> ab             a       | a     Fi(D),Fi(B),Fo(S),Fo(C)
B -> Da | ϵ         Da      | a     Fo(S),b
C -> BbA            Bb      | ab    Fi(A)
D -> ϵ                      |       Fi(B),Fo(S),a

FOLLOW
S   #       | #
A   a  SC   | a#
B   b  S    | b#
C   a       | a
D   a  S    | a#

    a       b       c       d       #
S   (CADB,1)(CADB,1)                (D,2)
A   (ab,3)
B   (Da,4)  (ϵ,5)                   (ϵ,5)
C   (BbA,6) (BbA,6)
D   (ϵ,7)                           (ϵ,7)