a-a a-b a-i a-t aaa aab aag aai aar aas aat aau ab- aba abb abg abi abr abs abt abu ag- aga agb agg agi agr ags agt agu ai- aia aib aig aii air ais ait aiu ar- ara arb arg ari arr ars art aru as- asa asb asg asi asr ass ast asu at- ata atb atg ati atr ats att atu au- aua aub aug aui aur aus aut b-u baa bab bag bai bar bas bat bau bba bbb bbg bbi bbr bbs bbt bbu bga bgb bgg bgi bgr bgs bgt bgu bi- bia bib big bii bir bis bit biu bra brb brg bri brr brs brt bru bsa bsb bsg bsi bsr bss bst bsu bta btb btg bti btr bts btt btu bua bub bug bui bur bus but buu gaa gab gag gai gar gas gat gau gba gbg gbi gbr gbs gbt gbu gga ggb ggg ggi ggr ggs ggt ggu gia gib gig gii gir gis git giu gra grb grg gri grr grs grt gru gsa gsb gsg gsi gsr gss gst gsu gta gtb gtg gti gtr gts gtt gtu gu- gua gub gug gui gur gus gut guu ia- iaa iab iag iai iar ias iat iau iba ibb ibg ibi ibr ibs ibt ibu iga igb igg igi igr igs igt igu iia iib iii iir iis iit iiu ir- ira irb irg iri irr irs irt iru is- isa isb isg isi isr iss ist isu ita itb itg iti its itt itu iu- iua iub iug iui iur ius iut ra- raa rab rag rai rar ras rat rau rba rbb rbg rbi rbr rbs rbt rbu rga rgb rgg rgi rgr rgs rgt ria rib rig rii rir ris rit rra rrb rrg rri rrr rrs rrt rru rsa rsb rsg rsi rsr rss rst rsu rta rtb rtg rti rtr rts rtt rtu rua rub rug rui rur rus rut ruu saa sab sag sai sar sas sat sau sba sbb sbg sbi sbr sbs sbt sbu sga sgb sgg sgi sgr sgs sgt sgu sia sib sig sii sir sis sit siu sr- sra srb srg sri srr srs srt ss- ssa ssb ssg ssi ssr sss sst ssu sta stb stg sti str sts stt stu sua sub sug sui sur sus sut suu taa tab tag tai tar tas tat tau tba tbb tbg tbi tbr tbs tbt tbu tga tgb tgg tgi tgr tgs tgt tgu tia tib tig tii tir tis tit tiu tra trb trg tri trr trs trt tru tsa tsb tsg tsi tsr tss tst tsu tta ttb ttg tti ttr tts ttt ttu tua tub tug tui tur tus tut tuu ua- uaa uab uag uai uar uas uat uau uba ubb ubg ubi ubr ubs ubt ubu uga ugb ugg ugi ugr ugs ugt ugu uia uib uig uii uir uis uit uiu ur- ura urb urg uri urr urs urt uru usa usb usg usi usr uss ust usu uta utb uti utr uts utt utu uua uug uur uus uut uuu