[antlr-interest] ANTLRWorks "synpredNN_MyGrammar" labels

[Ben Gillis]

 Why does ANTLRWorks display blocks with synpredNN__  labels?  e.g.

    {synpred25_MyGrammar}?

Ambiguous alternatives?  

When I duplicate the *exact-same* rule (all sub-rules included) in a smaller grammar to isolate the problem, the "synpredNN" labels never appear.

Thanks,
Ben
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