chen[7], echo[7], heco[7], chno[7], chon[7], henn[6], ceno[5], noce[5], ocen[5], neon[4],
che[6], ech[6], hec[6], hoc[6], och[6], hen[5], cen[4], cne[4], noc[4], eon[3], one[3], non[3],
eh[4], he[4], ho[4], oh[4], ce[3], co[3], en[2], eo[2], no[2], on[2],
