chno[7], chon[7], chor[7], ochr[7], ront[5], tron[5],
hoc[6], och[6], hot[6], hor[5], rho[5], noc[4], not[4], ton[4], ort[4], rot[4], tor[4], nor[3],
ho[4], oh[4], co[3], ot[3], to[3], no[2], on[2], or[2], ro[2],
