Remove grammar mistakes: To solve this problem, people tried to find different energy substitutions, among which is nuclear energy.
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The first one is the, the second is, and the third is, which is a, which is a, and so on.

The first one is the most common one.

The second one is the, which is, which is, which is, which is, which is, which is, which is, which is, which is, which is, which is, which is,