a-a a-b a-i aaa aab aaf aah aai aao aar aas ab- aba abb abf abh abi abo abr abs af- afa afb aff afh afi afo afr afs aha ahb ahf ahh ahi aho ahr ahs ai- aia aib aif aih aii aio air ais aoa aob aof aoh aoi aoo aor aos ar- ara arb arf arh ari aro arr ars as- asa asb asf ash asi aso asr ass baa bab baf bah bai bao bar bas bba bbb bbf bbh bbi bbo bbr bbs bfa bfb bff bfh bfi bfo bfr bfs bha bhb bhf bhh bhi bho bhr bhs bi- bia bib bif bih bii bio bir bis boa bob bof boh boi boo bor bos bra brb brf brh bri bro brr brs bsa bsb bsf bsh bsi bso bsr bss faa fab faf fah fai fao far fas fba fbb fbf fbh fbi fbo fbr fbs ffa fff ffh ffi ffo ffr ffs fha fhb fhf fhh fhi fho fhr fhs fia fib fif fih fii fir fis foa fob fof foh foi foo for fos fra frb frf frh fri fro frr frs fsa fsb fsf fsh fsi fso fsr fss h-i haa hab haf hah hai hao har has hba hbb hbf hbh hbi hbo hbr hbs hfa hfb hff hfh hfi hfo hfr hfs hha hhb hhf hhh hhi hho hhr hhs hia hib hif hih hii hio hir his hoa hob hof hoh hoi hoo hor hos hr- hra hrb hrf hrh hri hro hrr hrs hsa hsb hsf hsh hsi hsr hss i-f ia- iaa iab iaf iah iai iao iar ias iba ibb ibf ibh ibi ibo ibr ibs ifa ifb iff ifi ifo ifr ifs iha ihb ihf ihh ihi iho ihr ihs iia iib iif iih iii iio iir iis io- ioa iob iof ioh ioi ioo ior ios ir- ira irb irf iri iro irr irs is- isa isb isf ish isi iso isr iss o-i oaa oab oaf oah oai oao oar oas ob- oba obb obf obh obi obo obr obs of- ofa ofb off ofi ofo ofr ofs oha ohf ohh ohi oho ohr ohs oia oib oif oii oio oir ois oo- ooa oob oof ooh ooi ooo oor oos or- ora orb orf orh ori oro orr ors os- osa osb osf osh osi oso osr oss ra- raa rab raf rah rai rao rar ras rba rbb rbf rbh rbi rbo rbr rbs rfa rfb rff rfh rfi rfo rfr rfs rh- rha rhb rhf rhh rhi rho rhr rhs ria rib rif rih rii rio rir ris roa rob rof roh roi roo ror ros rra rrb rrf rrh rri rrr rrs rsa rsb rsf rsh rsi rso rsr rss saa sab saf sah sai sao sar sas sba sbb sbf sbh sbi sbo sbr sbs sfa sfb sff sfh sfi sfo sfr sfs sh- sha shb shf shh shi sho shr shs sia sib sif sih sii sio sir sis soa sob sof soh soi soo sor sos sr- sra srb srf srh sri sro srr srs ss- ssa ssb ssf ssh ssi sso ssr sss