opioid[8],
ooidu[8], podoi[7],
dipu[8], dupo[8], udoi[7], upoi[7], ooid[5],
dup[7], pud[7], idu[6], duo[6], udo[6], piu[6], opu[6], dip[5], pod[5], doi[4], ido[4], odo[4], poi[4],
ud[5], id[3], do[3], od[3], pi[3], op[3], po[3], ii[2],
