echem[9], helem[9], celem[8],
mech[8], eche[7], hece[7], hele[7], cele[6], elce[6], emce[6], mele[6],
che[6], ech[6], hec[6], hel[6], hem[6], ehe[5], cel[5], cle[5], lec[5], mel[5], lee[4], mee[4],
hm[5], eh[4], he[4], ce[3], el[3], em[3], me[3], ee[2],
