-ic a-a a-b a-c a-i a-t aaa aab aac aag aai aar aas aat aau ab- aba abb abc abg abi abr abs abt abu ac- aca acb acc acg aci acr acs act acu ag- aga agb agc agg agi agr ags agt agu ai- aia aib aic aig aii air ais ait aiu ar- ara arb arc arg ari arr ars art aru as- asa asb asc asg asi asr ass ast asu at- ata atb atc atg ati atr ats att atu au- aua aub auc aug aui aur aus aut b-u baa bab bac bag bai bar bas bat bau bba bbb bbc bbg bbi bbr bbs bbt bbu bca bcb bcc bcg bci bcr bcs bct bcu bga bgb bgc bgg bgi bgr bgs bgt bgu bi- bia bib bic big bii bir bis bit biu bra brb brg bri brr brs brt bru bsa bsb bsc bsg bsi bsr bss bst bsu bta btb btc btg bti btr bts btt btu bua bub buc bug bui bur bus but buu c-- caa cab cac cag cai car cas cat cau cba cbb cbc cbg cbi cbr cbs cbt cbu cca ccb ccc ccg cci ccr ccs cct ccu cga cgb cgc cgg cgi cgr cgs cgt cgu ci- cia cib cic cig cii cir cis cit ciu cra crb crc crg cri crr crs crt cru csa csb csc csg csi csr css cst csu cta ctb ctc ctg cti ctr cts ctt ctu cua cub cuc cug cui cur cus cut cuu gaa gab gac gag gai gar gas gat gau gba gbc gbg gbi gbr gbs gbt gbu gca gcb gcc gcg gci gcr gcs gct gcu gga ggb ggc ggg ggi ggr ggs ggt ggu gia gib gic gig gii gir gis git giu gra grb grc grg gri grr grs grt gru gsa gsb gsc gsg gsi gsr gss gst gsu gta gtb gtc gtg gti gtr gts gtt gtu gu- gua gub guc gug gui gur gus gut guu ia- iaa iab iac iag iai iar ias iat iau iba ibb ibc ibg ibi ibr ibs ibt ibu ica icb icc icg ici icr ics ict icu iga igb igc igg igi igr igs igt igu iia iib iic iii iir iis iit iiu ir- ira irb irc irg iri irr irs irt iru is- isa isb isc isg isi isr iss ist isu ita itb itc itg iti its itt itu iu- iua iub iuc iug iui iur ius iut ra- raa rab rac rag rai rar ras rat rau rba rbb rbc rbg rbi rbr rbs rbt rbu rca rcb rcc rcg rci rcr rcs rct rcu rga rgb rgc rgg rgi rgr rgs rgt ria rib ric rig rii rir ris rit rra rrb rrc rrg rri rrr rrs rrt rru rsa rsb rsc rsg rsi rsr rss rst rsu rta rtb rtc rtg rti rtr rts rtt rtu rua rub ruc rug rui rur rus rut ruu saa sab sac sag sai sar sas sat sau sba sbb sbc sbg sbi sbr sbs sbt sbu sca scb scc scg sci scr scs sct scu sga sgb sgc sgg sgi sgr sgs sgt sgu sia sib sic sig sii sir sis sit siu sr- sra srb src srg sri srr srs srt ss- ssa ssb ssc ssg ssi ssr sss sst ssu sta stb stc stg sti str sts stt stu sua sub suc sug sui sur sus sut suu taa tab tac tag tai tar tas tat tau tba tbb tbc tbg tbi tbr tbs tbt tbu tca tcb tcc tcg tci tcr tcs tct tcu tga tgb tgc tgg tgi tgr tgs tgt tgu tia tib tic tig tii tir tis tit tiu tra trb trc trg tri trr trs trt tru tsa tsb tsc tsg tsi tsr tss tst tsu tta ttb ttc ttg tti ttr tts ttt ttu tua tub tuc tug tui tur tus tut tuu ua- uaa uab uac uag uai uar uas uat uau uba ubb ubc ubg ubi ubr ubs ubt ubu uca ucb ucc ucg uci ucr ucs uct ucu uga ugb ugc ugg ugi ugr ugs ugt ugu uia uib uic uig uii uir uis uit uiu ur- ura urb urc urg uri urr urs urt uru usa usb usc usg usi usr uss ust usu uta utb utc uti utr uts utt utu uua uuc uug uur uus uut uuu