The pro at a golf course stocks two identical sets of womens clubs, reordering at the end

Question:

The pro at a golf course two identical sets of women’s clubs, reordering at the end of each day (for delivery early the next morning) if and only if he has sold them both. Construct a tree diagram to show that if he starts on a Monday with two sets of the clubs, there are altogether eight different ways in which he can make sales on the first two days of that week.
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