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You have
(GenericElements?,Person?,Location?)*,Person,(GenericElements?,Person?,Location?)*
which is ambiguous as you can't tell, the first time you get a Person,
whether you are still in the first ()* clause or whether it is your
mandatory middle Person.
You can re-write it as
(GenericElements,Location)*,Person,(GenericElements,Person,Location)*
Which isn't ambiguous.
David
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