a-a a-c aaa aac aah aan aao ac- aca acc ach acn aco aha ahc ahh ahn aho an- ana anc anh ann ano aoa aoc aoh aon aoo c-- caa cac cah can cao cca ccc cch ccn cco ch- cha chc chh chn cho cn- cna cnc cnh cnn cno co- coa coc coh con coo haa hac hah han hao hca hcc hch hcn hco hha hhc hhh hhn hho hna hnc hnh hnn hno hoa hoc hoh hon hoo naa nac nah nan nao nca ncc nch ncn nco nha nhc nhh nhn nna nnc nnh nnn nno no- noa noc noh non noo oaa oac oah oan oao oc- oca occ och ocn oco oha ohc ohh ohn oho on- ona onc onh onn ono oo- ooa ooc ooh oon ooo