rdf - bug or wrong way for VALUES in SPARQL, OpenLink Virtuoso? -

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I have Virtuoso 7.10 and the command value works for 1 * x or x * 1 such as asign on the table:

SELECT * WHERE {VALUES (? Z? R? T) {("x" "y" "z")}}

and its For: 

  SELECT * WHERE {VALUES? The problem is that when I try to assign:  
  SELECT * WHERE {VALUES (? Z? R? T) {("x" "y" "z") ("xy" "yx" "zx")}}  
 
 then As a result, I only have the first column filled, but the other two are empty (similar to two columns). Is this a bug or am I doing something wrong? Is there any remedy?


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