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[PVS-Help] turning off rewrite

I have a recursively defined relation named <= on a datatype which I don't 
want to use as a rewrite.  Following the definition of <= I declare

   AUTO_REWRITE- <= : [dty,dty -> bool]

But grind on sequents involving <= seems to diverge rewriting it:

   Warning: Rewriting depth = 50; Rewriting with <=

I tried (stop-rewrite "myTheoryname.<=") which yields

   classtableSig.<= is not an auto-rewrite

How do I determine the installed rewrites, and more importantly uninstall 
this one?