bobo[8], dobo[7], boro[6], robo[6], drop[6], odro[5], ordo[5], poro[5], ropo[5],
bob[7], bod[6], pod[5], bor[5], rob[5], odo[4], odr[4], ord[4], rod[4], por[4], pro[4], rop[4], oro[3],
bo[4], do[3], od[3], op[3], po[3], or[2], ro[2],
