[rules-users] Are implicit ANDs allowed in "not" blocks?

This rule: rule "Not" when not( RuleTime() Patient() ) then System.out.println("not"); end produces the following errors when compiled: [ERR 102] Line 43:5 mismatched input 'Patient' expecting ')' in rule "Not" [ERR 102] Line 44:5 mismatched input ')' expecting 'then' in rule "Not" But if I change it to use explicit ANDs instead of implicit ANDs it compiles and runs. rule "NotBlock" when not( RuleTime() and Patient() ) then System.out.println("notBlock"); end Is it invalid syntax to use implicit ANDs in a not block? If so, why? Thank You, Nathan Bell