YES
af/ONE-SORTED/709.trs
Input rules:
   [ b -> c,
     a -> a ]
Sorts having no ground terms: 
Rules applicable to ground terms:
   [ b -> c,
     a -> a ]
Constructor pattern: [c]
Defined pattern: [a,b]
Constructor subsystem:
   [ ]
Modified Constructor subsystem:
   [ ]
No orientable rules for a. Add rules, and retry...
failed to construct defining rules
Retry with a different D/C-partition.
Constructor pattern: [c,a]
Defined pattern: [b]
Constructor subsystem:
   [ a -> a ]
a -> a
{}
   [  ]
Modified Constructor subsystem:
   [ ]
candidate for b:
   [ b -> c ]
Find a quasi-ordering ...
order successfully found
Precedence:
 b : Mul;
 a : Mul;
 c : Mul;
Rules:
   [ b -> c ]
Conjectures:
   [ ]
STEP 0
ES:
   [ ]
HS:
   [ ]
ES0:
   [ ]
HS0:
   [ ]
ES1:
   [ ]
HS1:
   [ ]
: Success(GCR)
(2 msec.)
0.02