# sympy__sympy-14396
# Loki Mode Multi-Agent Patch
# Attempts: 1

Based on the architect's analysis, I can generate the patch for the `Domain.preprocess` method in `sympy/polys/polyoptions.py`. The fix adds handling for `RR` and `CC` ground domains in both polynomial ring (`[...]`) and fraction field (`(...)`) patterns.

```
--- a/sympy/polys/polyoptions.py
+++ b/sympy/polys/polyoptions.py
@@ -459,6 +459,10 @@ class Domain(with_metaclass(OptionType, Option)):
                     return sympy.polys.domains.ZZ.poly_ring(*gens)
                 elif ground in ['Q', 'QQ']:
                     return sympy.polys.domains.QQ.poly_ring(*gens)
+                elif ground in ['R', 'RR']:
+                    return sympy.polys.domains.RR.poly_ring(*gens)
+                elif ground in ['C', 'CC']:
+                    return sympy.polys.domains.CC.poly_ring(*gens)
                 else:
                     raise OptionError('expected a valid domain specification, got %s' % domain)
 
@@ -470,6 +474,10 @@ class Domain(with_metaclass(OptionType, Option)):
                     return sympy.polys.domains.ZZ.frac_field(*gens)
                 elif ground in ['Q', 'QQ']:
                     return sympy.polys.domains.QQ.frac_field(*gens)
+                elif ground in ['R', 'RR']:
+                    return sympy.polys.domains.RR.frac_field(*gens)
+                elif ground in ['C', 'CC']:
+                    return sympy.polys.domains.CC.frac_field(*gens)
                 else:
                     raise OptionError('expected a valid domain specification, got %s' % domain)
 
```