chno[7], chon[7], hond[7], dhow[7], donn[5], down[5], zond[5],
hoc[6], och[6], cod[5], doc[5], noc[4], dno[4], don[4], doz[4], non[3], won[3], zon[3],
ho[4], oh[4], co[3], do[3], od[3], no[2], on[2], oz[2],
