NO
af/ONE-SORTED/38.trs
Input rules:
   [ b -> a,
     b -> c,
     c -> b,
     c -> d ]
Sorts having no ground terms: 
Rules applicable to ground terms:
   [ b -> a,
     b -> c,
     c -> b,
     c -> d ]
Constructor pattern: [a,d]
Defined pattern: [c,b]
Constructor subsystem:
   [ ]
Modified Constructor subsystem:
   [ ]
candidate for c:
   [ c -> b ]
   [ c -> d ]
candidate for b:
   [ b -> a ]
   [ b -> c ]
Find a quasi-ordering ...
order successfully found
Precedence:
 c : Mul,  b : Mul;
 d : Mul;
 a : Mul;
Rules:
   [ c -> d,
     b -> a ]
Conjectures:
   [ b = c,
     c = b ]
STEP 0
ES:
   [ b = c,
     c = b ]
HS:
   [ ]
ES0:
   [ a = d,
     d = a ]
HS0:
   [ ]
ES1:
   [ a = d,
     d = a ]
HS1:
   [ ]
: Success(not GCR)
(3 msec.)
0.02