a-a a-b aaa aab aaf aan aao aar aas ab- aba abb abf abn abo abr abs af- afa afb aff afn afo afr afs an- ana anb anf ann ano anr ans aoa aob aof aon aoo aor aos ar- ara arb arf arn aro arr ars as- asa asb asf asn aso asr ass baa bab baf ban bao bar bas bba bbb bbf bbn bbo bbr bbs bfa bfb bff bfn bfo bfr bfs bna bnb bnf bnn bno bnr bns boa bob bof bon boo bor bos bra brb brf brn bro brr brs bsa bsb bsf bsn bso bsr bss faa fab faf fan fao far fas fba fbb fbf fbn fbo fbr fbs ffa fff ffn ffo ffr ffs fna fnb fnf fnn fnr fns foa fob fof fon foo for fos fra frb frf frn fro frr frs fsa fsb fsf fsn fso fsr fss naa nab naf nan nao nar nas nba nbb nbf nbn nbo nbr nbs nfa nfb nff nfn nfo nfr nfs nna nnb nnf nnn nno nns no- noa nob nof non noo nor nos nra nrb nrf nrn nro nrr nrs nsa nsb nsf nsn nso nsr nss oaa oab oaf oan oao oar oas ob- oba obb obf obn obo obr obs of- ofa ofb off ofn ofo ofr ofs on- ona onb onf onn ono onr ons oo- ooa oob oof oon ooo oor oos or- ora orb orf orn oro orr ors os- osa osb osf osn oso osr oss ra- raa rab raf ran rao rar ras rba rbb rbf rbn rbo rbr rbs rfa rfb rff rfn rfo rfr rfs rna rnb rnn rno rnr rns roa rob rof ron roo ror ros rra rrb rrf rrn rrr rrs rsa rsb rsf rsn rso rsr rss saa sab saf san sao sar sas sba sbb sbf sbn sbo sbr sbs sfa sfb sff sfn sfo sfr sfs sna snb snf snn sno snr sns soa sob sof son soo sor sos sr- sra srb srf srn sro srr srs ss- ssa ssb ssf ssn sso ssr sss

-ana aaaa aaab aaaf aaan aaar aaas aaba aabb aafa aafb aaff aana aaon aaoo aara aaro aars aasa aasf aass abaa abab abaf aban abar abas abb- abba abbb abbo abbr abbs abff aboa abob abof abon aboo abor abos abra abro abrs abs- absa absf abss afaa afan afao afar afbs affa affo affs afoa afoo afor afr- afra afro afrs afsa afsb ana- anaa anab anan anao anar anas anba anbb anbo anfa anfo anna annb anno anns ano- anoa anon anor anos ansa ansf anso aoba aonb aono aora aorb aorn aors aoss arab araf aran arar aras arba arbs arfa arfb arff arfs arna arno arns aroa arob aron aroo aror aros arr- arra arro arrr arrs ars- arsa arso asaa asab asaf asan asao asar asas asba asbo asfa asno asob asof ason asor asos asra asro asrs assa assn asso assr asss baaa baaf baan baar baas baba babb babo babr babs baff bafo bana bann bano banr bans baon baos bar- bara barb barf barn baro barr bars basa basf baso bass bbas bbbb bbbs bbfn bfas bffs bfsr bnas bnor bnrr bnss boab boan boar boas boba bobb bobo bobs bofa boff bofs bona bonn bono bons boob boof boon boor boos bor- bora borf born boro borr bors bosa bosn boso boss brab braf bran brao bras brna brno brns broa brob bron broo bror bros brrr brrs brsb brsr bsaa bsas bsfa bsff bsfs bsns bson bsos bsra faaa faan faas faba fabo fabs fafa faff fafo fana fano fans faon fara farb faro farr fars fasa fasn faso fass fbar fbrs ffar ffff ffrr ffsa ffss fnar fnrs foaf foan foar foba fobs fofo fono fons foof foon foos for- fora forb forn foro forr fors fosa fosb foso foss frab fran fras frns frob fron fros frsb frso fsas fsfo fsra fssa fssf naaa naab naan naar naas naba nabf nabo nabs nafa naff nafo nafs nan- nana nanb nann nano nans naor naos nara narf narn naro narr nars nas- nasa nasb nasf naso nasr nass nbaa nbaf nbar nbas nbbo nbfa nfaa nfas nfff nfon nfra nfrs nfsr nnnn nnos nnsa nnss noaa noba nobo nobs non- nona nonn nono nons noo- noob noon nooo noor noos nor- nora norb norf norn noro norr nors nos- nosa noss nrab nras nrna nron nrsa nsaa nsar nsbo nsfs nsna nsnr nsof nsos nsra nssa nssb nssf nsso nssr nsss oafo oafs oara oars oass oban obas obba obbo obon obor obos obra obro obsn obsr obss ofan ofas off- offa offo offr offs ofna ofno ofor ofra onab onan onar onas onna onno onon onor onos onra onso ooaa ooba ooff oofs oona oons oooo ooos oora oosa orab oran orao orar oras orba orbb orbo orbs orff orfs orna orno orns oro- orof oron oror oros orra orro orrs orsa orso osaf osan osar osas osba osfa osno osnr osoo osor osos osro ossa ossb osso raab raaf raan raas raba rabb rabo rabs rafa raff rana rann rano rans raob raos rara rarb rarf raro rars rasa raso rass rbaf rbbb rbbr rbbs rbss rnaf rnas rnbr roab roaf roan roar roas rob- roba robb robo robs roff rofo rona rono rons roob roof roon roor roos rora roro rosa roso ross rras rrna rrrr rsaa rsaf rsna rsnn rsno rsnr rsos rssa s-os saab saaf saan saar saas saba sabb sabo sabr sabs safa safb saff safo safr sana sann sano sanr sans saon saor saos sara sarf sarn saro sarr sars sasa sasf saso sass sbaa sbar sbas sbbs sbor sbsa sfar sfas sfba sfnb sfor sfos sfra sfro sfss snab snar snas snba snns snoa snob snoo snor snos snra snrs soan soar soas soba sobo sobr sobs sofa sofo son- sona sono sons soof soon