Merge 69447f879f into e439700992
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## Non-Terminals and Terminals
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Non-terminal symbols (rule names) stand for a pattern of terminals and other non-terminals. They are required to be a dashed lowercase word, like `move`, `castle`, or `check-mate`.
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Non-terminal symbols (rule names) stand for a pattern of terminals and other non-terminals. Rule names can be composed of letters (both uppercase and lowercase), numbers, dashes, and underscores. For example: `move`, `castle`, `check-mate`, `dataType`, `UPPER-CASE`, or `rule_123` are all valid non-terminal names.
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Terminals are actual characters ([code points](https://en.wikipedia.org/wiki/Code_point)). They can be specified as a sequence like `"1"` or `"O-O"` or as ranges like `[1-9]` or `[NBKQR]`.
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