Don't show a specific attribute value

Hello,

Please, help me.
I want to know if there's a way to generate the rules (Weka - Association Rules) without a specific attribute value. For example: I have an attribute "play" that can assume "true" or "false", so, I want to generate rules that contain the attribute "play" with only the "true" value, is not interesting for me see this attribute with the "false" value.

How can I do it?

I want to do this because I have 50 boolean attributes. So, the Weka generates a lot of rules, with several combinations between them, that is, a lot of not interesting rules.

Thanks a lot.
Andreza