bohr[8], chno[7], chon[7], chor[7], ochr[7], bron[6], proc[6],
cob[6], hoc[6], och[6], hop[6], bon[5], bor[5], rob[5], hor[5], rho[5], noc[4], por[4], pro[4], rop[4], nor[3],
bo[4], ho[4], oh[4], co[3], op[3], po[3], no[2], on[2], or[2], ro[2],
