a-a a-b a-i aaa aab aaf aah aai aao aap aar ab- aba abb abf abh abi abo abp abr af- afa afb aff afh afi afo afp afr aha ahb ahf ahh ahi aho ahp ahr ai- aia aib aif aih aii aio aip air aoa aob aof aoh aoi aoo aop aor ap- apa apb apf aph api apo app apr ar- ara arb arf arh ari aro arp arr b-p baa bab baf bah bai bao bap bar bba bbb bbf bbh bbi bbo bbp bbr bfa bfb bff bfh bfi bfo bfp bfr bha bhb bhf bhh bhi bho bhp bhr bi- bia bib bif bih bii bio bip bir boa bob bof boh boi boo bop bor bpa bpb bpf bph bpi bpo bpp bpr bra brb brf brh bri bro brp brr faa fab faf fah fai fao fap far fba fbb fbf fbh fbi fbo fbp fbr ffa fff ffh ffi ffo ffp ffr fha fhb fhf fhh fhi fho fhp fhr fia fib fif fih fii fip fir foa fob fof foh foi foo fop for fpa fpb fph fpi fpo fpp fpr fra frb frf frh fri fro frp frr h-i haa hab haf hah hai hao hap har hba hbb hbf hbh hbi hbo hbp hbr hfa hfb hff hfh hfi hfo hfp hfr hha hhb hhf hhh hhi hho hhp hhr hia hib hif hih hii hio hip hir hoa hob hof hoh hoi hoo hop hor hpa hpb hpf hph hpi hpo hpp hpr hr- hra hrb hrf hrh hri hro hrp hrr i-f ia- iaa iab iaf iah iai iao iap iar iba ibb ibf ibh ibi ibo ibp ibr ifa ifb iff ifi ifo ifp ifr iha ihb ihf ihh ihi iho ihp ihr iia iib iif iih iii iio iip iir io- ioa iob iof ioh ioi ioo iop ior ipa ipb ipf ipi ipo ipp ipr ir- ira irb irf iri iro irp irr o-i oaa oab oaf oah oai oao oap oar ob- oba obb obf obh obi obo obp obr of- ofa ofb off ofi ofo ofp ofr oha ohf ohh ohi oho ohp ohr oia oib oif oii oio oip oir oo- ooa oob oof ooh ooi ooo oop oor op- opa opb opf oph opi opo opp opr or- ora orb orf orh ori oro orp orr p-p paa pab paf pah pai pao pap par pba pbb pbf pbi pbo pbp pbr pfa pfb pff pfi pfo pfp pfr pha phb phf phi pho php phr pia pib pif pih pii pio pip pir poa pob pof poh poi poo pop por ppa ppb ppf pph ppi ppo ppp ppr pra prb prf prh pri pro prp prr ra- raa rab raf rah rai rao rap rar rba rbb rbf rbh rbi rbo rbp rbr rfa rfb rff rfh rfi rfo rfp rfr rh- rha rhb rhf rhh rhi rho rhp rhr ria rib rif rih rii rio rip rir roa rob rof roh roi roo rop ror rpa rpb rpf rph rpi rpo rpp rpr rra rrb rrf rrh rri rrp rrr