root[5], roto[5], toro[5], stoo[5], sort[5], stor[5], tors[5], roso[4],
oto[4], ort[4], rot[4], tor[4], sto[4], oro[3], oso[3], ros[3],
ot[3], to[3], ts[3], or[2], ro[2], os[2],
