chno[7], chon[7], soch[7], hops[7], shop[7], snop[5],
hoc[6], och[6], hop[6], noc[4], soc[4], osp[4], nos[3], son[3],
ho[4], oh[4], co[3], op[3], po[3], no[2], on[2], os[2],
