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Transformation of the AST



Hi,
 
I want ot transform an implication like "rich=true implies married=true"
to "not (rich=true) or married=true".
 
I can not change the AST, as I read in the sablecc descriptions.
 
Must I build my own tree (Jtree) to make the transformation or can I do it with
technics of CRT->AST Transformation?
 
Thank You in advance