Source: Original. Based upon Macalester College Problem of the Week #965, which asked the 4-letter version of this problem, of which there is a single solution.
There are 20 solutions. Here are 10 of them. The other 10 can be obtained by swapping the A's for B's and vice-versa. Only the first solution below contains all 8 allowable words beginning with A. A A B A A A A B B A A A B B A A B A B A A B A B A B B A B A B A A B B B B A B B B A A B B B A B A A B B A A B A B B A A A A B A A A B B A A A B B A B A A B B A B A B A B B A B A B B A B A A B A A B A B A B A B B B A B A B B A B A B B A B B B B A B A A B A B B A B A B B A B A B B A B A B B A B B A B A B A A B B A B A B B A B A B B A B A B A B B A A B A B B A A A B A A A A B B A A A B B A B A A B B A A B A B B B A B B B B A A B B B A A B A B A B A A B A B A A B B A A A B A A B A B B A A A A B A B