inro[4], iron[4], nori[4], orni[4], roni[4], norn[4], znoi[4],
ino[3], oni[3], non[3], inr[3], roi[3], nor[3], zin[3], zon[3], orz[3],
in[2], ni[2], no[2], on[2], or[2], ro[2], oz[2],
