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You can use a few techniques to make your grammar more readable:

1. Include Add comments including single-line //, and multi-line /* ... / and Javadoc-style /* ... */
2. Gather your simple token definitions (single characters, single words, etc.) into a tokens section at the top of the file.
3. Consider defining sub-parts of tokens with fragment rules. A fragment will never generate a token by itself but can be used as part of the rule defining another token.

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