chord[9],
bohr[8], bond[7], chno[7], chon[7], hond[7], chor[7], ochr[7], hord[7], bron[6], dorn[5], nord[5], rond[5],
cob[6], bod[6], hoc[6], och[6], cod[5], doc[5], bon[5], bor[5], rob[5], hor[5], rho[5], noc[4], dno[4], don[4], odr[4], ord[4], rod[4], nor[3],
bo[4], ho[4], oh[4], co[3], do[3], od[3], no[2], on[2], or[2], ro[2],
