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I have having a bit of trouble understanding your problem. Could you please post the entire SQL statement that is giving the problem. Also, is there a reason you are using the SEM_MATCH filter argument rather than the SPARQL syntax FILTER support inside the SEM_MATCH graph pattern?
Yes it's a little hard to read - should have been "filter => 'syn1 <> syn2" (which is a SPARQL filter).
I think the error comes from that you must specify both syn1 and syn2 in the select line; i.e. with the filter above you can't say:
select syn1 from FROM TABLE (SEM_MATCH (...
Regards - Christian