a-a a-b a-i aaa aab aah aai aao aap ab- aba abb abh abi abo abp aha ahb ahh ahi aho ahp ai- aia aib aih aii aio aip aoa aob aoh aoi aoo aop ap- apa apb aph api apo app b-p baa bab bah bai bao bap bba bbb bbh bbi bbo bbp bha bhb bhh bhi bho bhp bi- bia bib bih bii bio bip boa bob boh boi boo bop bpa bpb bph bpi bpo bpp h-i haa hab hah hai hao hap hba hbb hbh hbi hbo hbp hha hhb hhh hhi hho hhp hia hib hih hii hio hip hoa hob hoh hoi hoo hop hpa hpb hph hpi hpo hpp ia- iaa iab iah iai iao iap iba ibb ibh ibi ibo ibp iha ihb ihh ihi iho ihp iia iib iih iii iio iip io- ioa iob ioh ioi ioo iop ipa ipb ipi ipo ipp o-i oaa oab oah oai oao oap ob- oba obb obh obi obo obp oha ohh ohi oho ohp oia oib oii oio oip oo- ooa oob ooh ooi ooo oop op- opa opb oph opi opo opp p-p paa pab pah pai pao pap pba pbb pbi pbo pbp pha phb phi pho php pia pib pih pii pio pip poa pob poh poi poo pop ppa ppb pph ppi ppo ppp