a-a a-b a-i aaa aab aah aai aao aap aar aax ab- aba abb abh abi abo abp abr abx aha ahb ahh ahi aho ahp ahr ahx ai- aia aib aih aii aio aip air aix aoa aob aoh aoi aoo aop aor aox ap- apa apb aph api apo app apr apx ar- ara arb arh ari aro arp arr arx ax- axa axh axi axo axp axr axx b-p baa bab bah bai bao bap bar bax bba bbb bbh bbi bbo bbp bbr bbx bha bhb bhh bhi bho bhp bhr bhx bi- bia bib bih bii bio bip bir bix boa bob boh boi boo bop bor box bpa bpb bph bpi bpo bpp bpr bpx bra brb brh bri bro brp brr brx bxb bxi bxo bxx h-i haa hab hah hai hao hap har hax hba hbb hbh hbi hbo hbp hbr hbx hha hhb hhh hhi hho hhp hhr hia hib hih hii hio hip hir hix hoa hob hoh hoi hoo hop hor hox hpa hpb hph hpi hpo hpp hpr hr- hra hrb hrh hri hro hrp hrr ia- iaa iab iah iai iao iap iar iba ibb ibh ibi ibo ibp ibr ibx iha ihb ihh ihi iho ihp ihr iia iib iih iii iio iip iir iix io- ioa iob ioh ioi ioo iop ior ipa ipb ipi ipo ipp ipr ipx ir- ira irb iri iro irp irr irx ixi o-i oaa oab oah oai oao oap oar oax ob- oba obb obh obi obo obp obr obx oha ohh ohi oho ohp ohr oia oib oii oio oip oir oo- ooa oob ooh ooi ooo oop oor oox op- opa opb oph opi opo opp opr opx or- ora orb orh ori oro orp orr orx ox- oxa oxb oxi oxo oxx p-p paa pab pah pai pao pap par pax pba pbb pbi pbo pbp pbr pbx pha phb phi pho php phr phx pia pib pih pii pio pip pir pix poa pob poh poi poo pop por pox ppa ppb pph ppi ppo ppp ppr ppx pra prb prh pri pro prp prr prx pxr ra- raa rab rah rai rao rap rar rax rba rbb rbh rbi rbo rbp rbr rbx rh- rha rhb rhh rhi rho rhp rhr ria rib rih rii rio rip rir rix roa rob roh roi roo rop ror rox rpa rpb rph rpi rpo rpp rpr rpx rra rrb rrh rri rrp rrr rxp rxr xaa xap xar xbr xbx xhp xia xii xio xix xoa xoi xoo xop xor xox xpa xpb xpo xpp xrx xxi xxo xxp xxx