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[mizar] Some minor changes in the Mizar grammar file.



Hi all,

The following rules were changed in order to support predefined mode "set", 
functor brackets "{", "[", "}", "]" and predicate "=".

-----------------------------------------------
From:
Mode-Symbol = Symbol .

To:
Mode-Symbol = Symbol | "set" .
-----------------------------------------------
From:
Left-Functor-Bracket = Symbol .
Right-Functor-Bracket = Symbol .

To:
Left-Functor-Bracket = Symbol | "{" | "[" .
Right-Functor-Bracket = Symbol | "}" | "]" .
-----------------------------------------------
From:
Predicate-Symbol = Symbol .

To:
Predicate-Symbol = Symbol | "=" .
-----------------------------------------------

Regards,
  Michael Nedzelsky