YES
exiting with thread!
(VAR x )
(RULES 
        c(c(x)) -> d(d(d(x)))
        b(x) -> d(d(x))
        d(d(d(c(x)))) -> d(d(d(d(x))))
        d(d(d(d(d(x))))) -> d(d(d(d(x))))
        c(d(x)) -> d(d(d(d(x))))
        a(x) -> d(d(d(d(x))))
        e(d(x)) -> d(d(d(d(e(x)))))
        e(c(x)) -> d(d(d(d(e(x)))))
        
)