pirop[7],
pipo[6], popi[6], piwo[5], wpoi[5],
pip[5], pop[5], poi[4], por[4], pro[4], rop[4], piw[4], iii[3], roi[3], wii[3], iwo[3], owi[3], wio[3], wir[3], rwo[3],
pi[3], op[3], po[3], ii[2], or[2], ro[2], iw[2],
