YES
af/ONE-SORTED/691.trs
Input rules:
   [ h(a,a) -> f(c),
     a -> a,
     a -> a,
     b -> h(c,a) ]
Sorts having no ground terms: 
Rules applicable to ground terms:
   [ h(a,a) -> f(c),
     a -> a,
     a -> a,
     b -> h(c,a) ]
Constructor pattern: [h(?x_1,?x_2),f(?x_1),c]
Defined pattern: [b,a]
Constructor subsystem:
   [ ]
Modified Constructor subsystem:
   [ ]
candidate for b:
   [ b -> h(c,a) ]
No orientable rules for a. Add rules, and retry...
failed to construct defining rules
Retry with a different D/C-partition.
Constructor pattern: [h(?x_1,?x_2),f(?x_1),c,a]
Defined pattern: [b]
Constructor subsystem:
   [ h(a,a) -> f(c),
     a -> a,
     a -> a ]
a -> a
{}
   [  ]
a -> a
{}
   [  ]
Modified Constructor subsystem:
   [ h(a,a) -> f(c) ]
candidate for b:
   [ b -> h(c,a) ]
Find a quasi-ordering ...
order successfully found
Precedence:
 b : Mul;
 h : Mul;
 c : Mul,  a : Mul;
 f : Mul;
Rules:
   [ b -> h(c,a),
     h(a,a) -> f(c) ]
Check confluence of constructor subsystem...
Check Termination...
Terminating, WCR: CR
Conjectures:
   [ ]
STEP 0
ES:
   [ ]
HS:
   [ ]
ES0:
   [ ]
HS0:
   [ ]
ES1:
   [ ]
HS1:
   [ ]
: Success(GCR)
(4 msec.)
0.02