chno[7], chon[7],
hoc[6], och[6], mho[6], ohm[6], hop[6], com[5], moc[5], mop[5], noc[4], mon[4], nom[4],
hm[5], ho[4], oh[4], co[3], om[3], op[3], po[3], no[2], on[2],
