please answer the question below:

For each of the sequence w = e1,...,elast below, determine whether they
are subsequences of the following data sequence:
{A, B}{C, D}{A, B}{C, D}{A, B}{C, D}
subjected to the following timing constraints:
mingap = 0 (interval between last event in ei and first event

in ei+1 is > 0)

maxgap = 2 (interval between first event in ei and last event
in ei+1 is ? 2)
maxspan = 6 (interval between first event in e1 and last event
in elast is ? 6)
ws = 1 (time between first and last events in ei is ? 1)
(a) w = {A}{B}{C}{D}
(a) w = {A}{B}{C}{D}
(c) w = {A}{B, C, D}{A}
(d) w = {B,C}{A, D}{B,C}
(d) w = {B,C}{A, D}{B,C}

(a) w = {A}{B}{C}{D}
Answer: Yes.
(b) w = {A}{B, C, D}{A}
Answer: No.
(c) w = {A}{B, C, D}{A}
Answer: No.
(d) w = {B,C}{A, D}{B,C}
Answer: No.
(e) w = {A, B, C, D}{A, B, C, D}
Answer: No.