mchem[10], echem[9], hemem[9],
mech[8], eche[7], hece[7], emce[6],
mhm[7], che[6], ech[6], hec[6], hem[6], ehe[5], mem[5], mee[4],
hm[5], eh[4], he[4], ce[3], em[3], me[3], ee[2],
