from : Identifiers - The Rust Reference

it is saying

RAW_IDENTIFIER → r# IDENTIFIER_OR_KEYWORD

and

NON_KEYWORD_IDENTIFIER → IDENTIFIER_OR_KEYWORDexcept a strict or reserved keyword

i am not sure why it is repeating the same thing here

IDENTIFIER → NON_KEYWORD_IDENTIFIER | RAW_IDENTIFIER

and what does it mean by

except _, RAW_IDENTIFIER, or $crate

here : Macros by example - The Rust Reference

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