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1range-set ::= range ( logical-or range ) *
2logical-or ::= ( ' ' ) * '||' ( ' ' ) *
3range ::= hyphen | simple ( ' ' simple ) * | ''
4hyphen ::= partial ' - ' partial
5simple ::= primitive | partial | tilde | caret
6primitive ::= ( '<' | '>' | '>=' | '<=' | '=' ) partial
7partial ::= xr ( '.' xr ( '.' xr qualifier ? )? )?
8xr ::= 'x' | 'X' | '*' | nr
9nr ::= '0' | [1-9] ( [0-9] ) *
10tilde ::= '~' partial
11caret ::= '^' partial
12qualifier ::= ( '-' pre )? ( '+' build )?
13pre ::= parts
14build ::= parts
15parts ::= part ( '.' part ) *
16part ::= nr | [-0-9A-Za-z]+