echem[9],
cham[8], mach[8], mech[8], echa[7], heca[7], eche[7], hece[7], mace[6], emce[6],
ach[6], cha[6], che[6], ech[6], hec[6], hem[6], ehe[5], mac[5], mee[4],
hm[5], ha[4], eh[4], he[4], ce[3], ma[3], em[3], me[3], ee[2],
