a- The dog had much fur.
b- The cat liked to purr.
b'- The cat's meow was often to occur.
a'- The dog was hairy for sure.
By the way, poetry does not need to rhyme, but this is what slipped out of my head early in the morning. Please do not try to make money off this unique poem; it won't happen. However, if you do, please give me some sort of royalty.
Anyway, much poetry was written this way. Sometimes there was a "c," "d," and so much more. The pattern was often quite easy to determine. However, sometimes the poet would throw a "hitch" into the poem. She or he would change the pattern in the last line. The poet would do this just to make a point.
Well, I didn't watch much of the Super Bowl on Sunday. I watched the final five minutes of the first half and the final fourteen minutes of the second half. The Super Bowl had a poetic sense. The end of each half had a poetic structure. If you want to outline the whole game you can. But in the final two minutes of each half a pattern seemed to develop. If a = TD by New England and b = TD by Seattle. The outline for the final two minutes of each half would be a, b, a', almost b'.
It was amazing how New England in the first half drove down the field for a touchdown in the final two minutes. They went ahead. Yet, in 31 seconds, Seattle did the same with two long runs and a long pass (a nice catch) by the wide receiver. They tied the game. Then again, in the second half it seemed to almost repeat itself. New England went ahead in the final two minutes of the game, but Seattle had plenty of time to score, more than a minute. They quickly drove down the field which included an amazing catch again that looked more like a pinball with the receiver catching it laying on the field. But then from the one yard line the quarterback threw an interception.
You were expecting a b'- a TD by Seattle. That would have been the poetic pattern. But the author of the game threw in a dramatic climax by going outside the pattern- the interception at the goal line. It made the poetry of this Super Bowl quite stunning and memorable.