rosie[5], serio[5], sorie[5], serir[5], sierr[5], resor[5],
osie[4], sire[4], eros[4], rosi[4],
rei[3], ero[3], roi[3], eis[3], sie[3], osi[3], sio[3], soi[3], ser[3], sir[3], ros[3],
eo[2], er[2], re[2], or[2], ro[2], es[2], se[2], si[2], os[2],
