a-a a-b aaa aab aad aaf aao aap aar aas ab- aba abb abd abf abo abp abr abs ad- ada adb add adf ado adp adr ads af- afa afb afd aff afo afp afr afs aoa aob aod aof aoo aop aor aos ap- apa apb apd apf apo app apr aps ar- ara arb ard arf aro arp arr ars as- asa asb asd asf aso asp asr ass b-p baa bab bad baf bao bap bar bas bba bbb bbd bbf bbo bbp bbr bbs bda bdb bdd bdf bdo bdp bdr bds bfa bfb bfd bff bfo bfp bfr bfs boa bob bod bof boo bop bor bos bpa bpb bpd bpf bpo bpp bpr bps bra brb brd brf bro brp brr brs bsa bsb bsd bsf bso bsp bsr bss daa dab dad daf dao dap dar das dba dbb dbd dbf dbo dbp dbr dbs dda ddb ddd ddf ddo ddp ddr dds dfa dfb dfd dff dfo dfp dfr dfs doa dob dod dof doo dop dor dos dpa dpb dpd dpf dpo dpp dpr dps dra drb drd dro drp drr drs dsa dsb dsd dsf dso dsp dsr dss faa fab fad faf fao fap far fas fba fbb fbd fbf fbo fbp fbr fbs fda fdb fdd fdf fdo fdp fdr fds ffa ffd fff ffo ffp ffr ffs foa fob fof foo fop for fos fpa fpb fpd fpo fpp fpr fps fra frb frd frf fro frp frr frs fsa fsb fsd fsf fso fsp fsr fss oaa oab oad oaf oao oap oar oas ob- oba obb obd obf obo obp obr obs oda odb odd odf odo odp odr ods of- ofa ofb ofd off ofo ofp ofr ofs oo- ooa oob ood oof ooo oop oor oos op- opa opb opd opf opo opp opr ops or- ora orb ord orf oro orp orr ors os- osa osb osd osf oso osp osr oss p-p paa pab pad paf pao pap par pas pba pbb pbd pbf pbo pbp pbr pbs pda pdb pdd pdf pdo pdp pdr pds pfa pfb pfd pff pfo pfp pfr pfs poa pob pod pof poo pop por pos ppa ppb ppd ppf ppo ppp ppr pps pra prb prd prf pro prp prr prs ps- psa psb psd psf pso psp psr pss ra- raa rab rad raf rao rap rar ras rba rbb rbd rbf rbo rbp rbr rbs rda rdb rdd rdf rdo rdp rdr rds rfa rfb rfd rff rfo rfp rfr rfs roa rob rod rof roo rop ror ros rpa rpb rpd rpf rpo rpp rpr rps rra rrb rrd rrf rrp rrr rrs rsa rsb rsd rsf rso rsp rsr rss saa sab sad saf sao sap sar sas sba sbb sbd sbf sbo sbp sbr sbs sda sdb sdd sdf sdo sdp sdr sds sfa sfb sfd sff sfo sfp sfr sfs soa sob sod sof soo sop sor sos spa spb spd spf spo spp spr sps sr- sra srb srd srf sro srp srr srs ss- ssa ssb ssd ssf sso ssp ssr sss

a-do aaaa aaab aaad aaaf aaap aaar aaas aaba aabb aabd aabp aada aads aafa aafb aafd aaff aaoo aapa aapo aaps aara aard aaro aarp aars aasa aasd aasf aass abaa abab abad abaf abap abar abas abb- abba abbb abbo abbr abbs abda abdo abff aboa abob abod abof aboo abor abos abpa abpd abpp abpr abps abra abro abrs abs- absa absd absf absp abss adaa adab adad adao adap adar adas adba adda addd addo addr adds adfa adfs adob adod adoo ador ados adp- adps adra adro adrs adsa adso adsr adss afaa afad afao afap afar afbs afdb affa affo affs afoa afoo afor afpa afr- afra afro afrs afsa afsb afsp aoba aopo aora aorb aors aosd aosp aoss apao apap apar apas apba apbr apbs apda apdd apds apfa apfo apo- apod apof apoo apop apor apos appa appd appr apps apra apro aprs apsa apso apss arab arad araf arap arar aras arba arbs arda ardf ardo ards arfa arfb arff arfs aroa arob arod aroo aror aros arpa arps arr- arra arro arrr arrs ars- arsa arsd arso asaa asab asad asaf asao asap asar asas asba asbo asda asdf asdo asds asfa asob asod asof asop asor asos aspa aspd aspo aspr asps asra asro asrs assa assd asso assp assr asss baaa baad baaf baar baas baba babb babo babr babs bada badb badd bado badr bads baff bafo baos bapa bapp baps bar- bara barb bard barf baro barr bars basa basf baso bass bbad bbas bbbb bbbs bbdd bbdo bbpr bd-r bdos bdsd bfas bffs bfpo bfpp bfsr boab boad boar boas boba bobb bobo bobs boda bodb bodo bods bofa bofd boff bofs boob bood boof boop boor boos bopa bopp bops bor- bora bord borf boro borr bors bosa boso boss bpda bprd bpsa brab brad braf brao bras brda brdo brds broa brob brod broo bror bros brrr brrs brsb brsr bsaa bsap bsas bsbd bsfa bsff bsfs bsod bsos bspp bspr bsra bsrd bssd d-bo daab daad daap daar daas daba dabb dabo dabp dabs dada dado dads dafa daff dafo dafs daos dapa dapp daps dara darb dard darf daro darp darr dars dasa dasb dasd dass dbar dbas dbfo dbfs dbos dbpd dbpf dbrs dbsa dbss dddd ddpo ddps ddss dfaf dfas dfds dffa dfrf doab doap doar doas doba dobb dobs dod- doda dodd dodo dods doff doob dood doof doop door doos dopa dopo dopp dopr dops dora dord dorf doro dorp dorr dors dosa doso doss dpaa dpos dppa dpsd draa drab drad draf drap drar dras drba drda drob drod drof drop drra drrs drsa drsp dsap dsba dsda dsdp dsdr dsfa dsoa dsos dspf dsps dsrp dsrr dssa dssp faaa faad faap faas faba fabd fabo fabs fada