oboro[7], proco[7], oporo[6],
obco[7], poco[6], boro[6], robo[6], proc[6], coro[5], poro[5], ropo[5],
cob[6], bor[5], rob[5], por[4], pro[4], rop[4], oro[3],
bo[4], co[3], op[3], po[3], or[2], ro[2],
