When a dime is tossed four times, there are the following 16 possible outcomes.

Here, for example, HTTH represents the outcome that the first toss is heads, the next two tosses are tails, and the fourth toss is heads. List the outcomes constituting each of the following four events.
A = event exactly two heads are tossed,
B = event the first two tosses are tails,
C = event the first toss is heads,
D = event all four tosses come up the same.

HHHH HTHH THHH TTHHH HHHT HTHT THHT TTHT HHTH HTTH THTH TTTH HHTT HTTT THTT TITT