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I am having difficulty cracking the logic game in section 1, questions 18-24. How do I go about solving this? Please help!

The trick to this game is to recognize that a cycle only takes 5 years and that there is really only one possibility to the game. There is no use to diagram the rules. They are pretty simply. If you just create a five year chart, plug in the letters, and don't violate any of the rules, you've found the one possibility for the game. The trick is that all of the letters are interchangeable for each other (that's why I say there is only one possibility).

Thank you! I finally solved it. The rules were so vague compared to those of other logic games I've come across. Guess I've got lots and lots to study for.