a-a a-b a-i aaa aab aah aai aao aar aas ab- aba abb abh abi abo abr abs aha ahb ahh ahi aho ahr ahs ai- aia aib aih aii aio air ais aoa aob aoh aoi aoo aor aos ar- ara arb arh ari aro arr ars as- asa asb ash asi aso asr ass baa bab bah bai bao bar bas bba bbb bbh bbi bbo bbr bbs bha bhb bhh bhi bho bhr bhs bi- bia bib bih bii bio bir bis boa bob boh boi boo bor bos bra brb brh bri bro brr brs bsa bsb bsh bsi bso bsr bss h-i haa hab hah hai hao har has hba hbb hbh hbi hbo hbr hbs hha hhb hhh hhi hho hhr hhs hia hib hih hii hio hir his hoa hob hoh hoi hoo hor hos hr- hra hrb hrh hri hro hrr hrs hsa hsb hsh hsi hsr hss ia- iaa iab iah iai iao iar ias iba ibb ibh ibi ibo ibr ibs iha ihb ihh ihi iho ihr ihs iia iib iih iii iio iir iis io- ioa iob ioh ioi ioo ior ios ir- ira irb iri iro irr irs is- isa isb ish isi iso isr iss o-i oaa oab oah oai oao oar oas ob- oba obb obh obi obo obr obs oha ohh ohi oho ohr ohs oia oib oii oio oir ois oo- ooa oob ooh ooi ooo oor oos or- ora orb orh ori oro orr ors os- osa osb osh osi oso osr oss ra- raa rab rah rai rao rar ras rba rbb rbh rbi rbo rbr rbs rh- rha rhb rhh rhi rho rhr rhs ria rib rih rii rio rir ris roa rob roh roi roo ror ros rra rrb rrh rri rrr rrs rsa rsb rsh rsi rso rsr rss saa sab sah sai sao sar sas sba sbb sbh sbi sbo sbr sbs sh- sha shb shh shi sho shr shs sia sib sih sii sio sir sis soa sob soh soi soo sor sos sr- sra srb srh sri sro srr srs ss- ssa ssb ssh ssi sso ssr sss