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 I got some old code from other friends, and even for the example in the "sample systems" from AB,
 
 I got the same error:
 
 And it's like "Missing short/cover variables..."
 
 The code is like this:
 
 Buy = state>Ref(state,-1);
 Sell = state<Ref(state,-1);
 
 --------------
 
 To get around the error message, I added,
 
 Buy = state>Ref(state,-1);
 Sell = state<Ref(state,-1);
 Short = Sell;
 Cover = Buy;
 
 Is that a right thing to do?
 
 Thanks a lot!
 
 
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