What would be the probability that exactly four heads would appear in a row when a coin is flipped five times, given that the first flip came up heads?

Would it be possible to work it out in ways, where the flips give the following scenarios:

(i) HHHHT

(ii) HHHHH

Please help answer by providing detailed and clear explanations of every theorem used for every step employed to get to the final answer. Thank you.

Note: No use of Combination, please.

As such, if possible, I would be quite grateful if you could formulate the explanation as shown here: https://www.slader.com/discussion/question/what-is-the-conditional-probability-that-exactly-four-heads-appear-when-a-fair-coin-is-flipped-fiv-2/