Answer:
Twain seemed to enjoy the process of learning to ride a bike, despite the many accidents he had. In these lines, he reflects on how quickly he learned this new skill, comparing it to learning to ride a horse:
At the end of this twelve working-hours' apprenticeship I was graduated—in the rough. I was pronounced competent to paddle my own bicycle without outside help. It seems incredible, this celerity of acquirement. It takes considerably longer than that to learn horseback-riding in the rough.
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