Counter
Diagram Context 
if isequal(rule,'Increment') krule=1; elseif isequal(rule,'Decrement') krule=-1; else error(['unknown rule ',oml2exp(rule)]); end
if isequal(rule,'Increment') krule=1; elseif isequal(rule,'Decrement') krule=-1; else error(['unknown rule ',oml2exp(rule)]); end