RR*ERR
We'll search for every combination of “River” and your other names.
RR*VER
RV*ERR
RV*VER
R*EER
R*VRR
R*VVR
RR*EER
RR*RRR
RR*VRR
RR*VVR
RV*EER
RV*RRR
R*ERR
R111VR*