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/**
- ::= |
- ::=
|| [][{][}] | [] - ::=
::= 1 | 2 | 3 | a | b | c ...- ::= alpha | beta / /*
- { } _ \
- 1 2 3 a b c
- [equiv] [ldots]
/ /*
::= {}- ::= {_}{{}}
- ::= <A1> | |
- ::= "[" | "]" | "_" | "{" | "}" | ""
- ::= "1" | "2" | "3" | "a" | "b" | "c" | "+" | "-" | "(" ...
- ::= []
- ::= "alpha" | "beta" | "ldots" ... */