Improve the grammar of this text: In addition, rail switches is used to maximize the usage of the tracks.
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In this case, the first letter of the first word is the same as the first letter of the second word.
The second word is the same as the first word.
The first word is the same as the second word.
The second word is the same as the first word.
The third word is the same as the first word.
The third word is the same as the first word.
The third word is the same as the first word.
The third word is