a-a a-b a-c aaa aab aac aah aan aap ab- aba abb abc abh abn abp ac- aca acb acc ach acn acp aha ahb ahc ahh ahn ahp an- ana anb anc anh ann anp ap- apa apb apc aph apn app b-p baa bab bac bah ban bap bba bbb bbc bbh bbn bbp bca bcb bcc bch bcn bcp bha bhb bhc bhh bhp bna bnb bnc bnn bnp bpa bpb bpc bph bpn bpp c-- caa cab cac cah can cap cba cbb cbc cbh cbn cbp cca ccb ccc cch ccn ccp ch- cha chb chc chh chn chp cn- cna cnb cnc cnh cnn cnp cpa cpb cpc cph cpn cpp haa hab hac hah han hap hba hbb hbc hbh hbn hbp hca hcb hcc hch hcn hcp hha hhb hhc hhh hhn hhp hna hnb hnc hnh hnn hpa hpb hpc hph hpn hpp naa nab nac nah nan nap nba nbb nbc nbn nbp nca ncb ncc nch ncn ncp nha nhb nhc nhh nhn nhp nna nnb nnc nnh nnn nnp npa npb npc nph npn npp p-p paa pab pac pah pan pap pba pbb pbc pbn pbp pca pcb pcc pch pcn pcp pha phb phc phn php pn- pna pnb pnc pnh pnn pnp ppa ppb ppc pph ppn ppp