otrop[7], porto[7],
port[6], prot[6], trop[6], wtop[6], poro[5], ropo[5], root[5], roto[5], toro[5],
pot[5], top[5], por[4], pro[4], rop[4], oto[4], ort[4], rot[4], tor[4], oro[3], owo[3], rwo[3],
op[3], po[3], ot[3], to[3], or[2], ro[2],
