php - Display posts from x cat and y tag -

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What is Mailing Carriage X "and" Tag Y?

It is possible to read fairs, it seems that you can do this: 

  query_posts ('tag = bread, baking');

or 

  query_posts ('cat = 2,6,17,38');

... Is it possible to use both cat and tag together?

I am not a wordpress expert, but what I see from seeing that function is that You should be able to use this notation to query against both at the same time. 

  query_posts ('tag = bread, baking & amp; cat = 2,6,17,38');

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