cong[7], chno[7], chon[7], chor[7], ochr[7], gron[6],
hoc[6], och[6], gon[5], gro[5], ogr[5], hor[5], rho[5], noc[4], nor[3],
go[4], ho[4], oh[4], co[3], no[2], on[2], or[2], ro[2],
