chno[7], chon[7], chor[7], ochr[7], soch[7], cors[5],
hoc[6], och[6], hor[5], rho[5], noc[4], soc[4], nor[3], nos[3], son[3], ros[3],
ho[4], oh[4], co[3], no[2], on[2], or[2], ro[2], os[2],
