EBNF
Cypher = [SP], Statement, [[SP], ';'], [SP], EOI ;
Statement = Query ;
Query = RegularQuery | StandaloneCall ;
RegularQuery = SingleQuery, { [SP], Union } ;
SingleQuery = SinglePartQuery | MultiPartQuery ;
Union = ((U,N,I,O,N), SP, (A,L,L), [SP], SingleQuery) | ((U,N,I,O,N), [SP], SingleQuery) ;
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