-ic a-a a-b a-c a-i a-t aaa aab aac aag aai aao aar aas aat aau ab- aba abb abc abg abi abo abr abs abt abu ac- aca acb acc acg aci aco acr acs act acu ag- aga agb agc agg agi ago agr ags agt agu ai- aia aib aic aig aii aio air ais ait aiu aoa aob aoc aog aoi aoo aor aos aot aou ar- ara arb arc arg ari aro arr ars art aru as- asa asb asc asg asi aso asr ass ast asu at- ata atb atc atg ati ato atr ats att atu au- aua aub auc aug aui auo aur aus aut b-u baa bab bac bag bai bao bar bas bat bau bba bbb bbc bbg bbi bbo bbr bbs bbt bbu bca bcb bcc bcg bci bco bcr bcs bct bcu bga bgb bgc bgg bgi bgo bgr bgs bgt bgu bi- bia bib bic big bii bio bir bis bit biu boa bob boc bog boi boo bor bos bot bou bra brb brg bri bro brr brs brt bru bsa bsb bsc bsg bsi bso bsr bss bst bsu bta btb btc btg bti bto btr bts btt btu bua bub buc bug bui buo bur bus but buu c-- caa cab cac cag cai cao car cas cat cau cba cbb cbc cbg cbi cbo cbr cbs cbt cbu cca ccb ccc ccg cci cco ccr ccs cct ccu cga cgb cgc cgg cgi cgo cgr cgs cgt cgu ci- cia cib cic cig cii cio cir cis cit ciu co- coa cob coc cog coi coo cor cos cot cou cra crb crc crg cri cro crr crs crt cru csa csb csc csg csi cso csr css cst csu cta ctb ctc ctg cti cto ctr cts ctt ctu cua cub cuc cug cui cuo cur cus cut cuu gaa gab gac gag gai gao gar gas gat gau gba gbc gbg gbi gbo gbr gbs gbt gbu gca gcb gcc gcg gci gco gcr gcs gct gcu gga ggb ggc ggg ggi ggo ggr ggs ggt ggu gia gib gic gig gii gio gir gis git giu goa gob goc gog goi goo gor gos got gou gra grb grc grg gri gro grr grs grt gru gsa gsb gsc gsg gsi gso gsr gss gst gsu gta gtb gtc gtg gti gto gtr gts gtt gtu gu- gua gub guc gug gui guo gur gus gut guu ia- iaa iab iac iag iai iao iar ias iat iau iba ibb ibc ibg ibi ibo ibr ibs ibt ibu ica icb icc icg ici ico icr ics ict icu iga igb igc igg igi igo igr igs igt igu iia iib iic iii iio iir iis iit iiu io- ioa iob ioc iog ioi ioo ior ios iot iou ir- ira irb irc irg iri iro irr irs irt iru is- isa isb isc isg isi iso isr iss ist isu ita itb itc itg iti ito its itt itu iu- iua iub iuc iug iui iur ius iut o-i oaa oab oac oag oai oao oar oas oat oau ob- oba obb obc obg obi obo obr obs obt obu oc- oca ocb occ ocg oci oco ocr ocs oct ocu oga ogc ogg ogi ogo ogs ogt oia oib oic oii oio oir ois oit oiu oo- ooa oob ooc oog ooi ooo oor oos oot or- ora orb orc org ori oro orr ors ort oru os- osa osb osc osg osi oso osr oss ost osu ot- ota otb otc otg oti oto otr ots ott otu ou- oua ouc oui ouo our ous out ra- raa rab rac rag rai rao rar ras rat rau rba rbb rbc rbg rbi rbo rbr rbs rbt rbu rca rcb rcc rcg rci rco rcr rcs rct rcu rga rgb rgc rgg rgi rgo rgr rgs rgt ria rib ric rig rii rio rir ris rit roa rob roc rog roi roo ror ros rot rou rra rrb rrc rrg rri rrr rrs rrt rru rsa rsb rsc rsg rsi rso rsr rss rst rsu rta rtb rtc rtg rti rto rtr rts rtt rtu rua rub ruc rug rui ruo rur rus rut ruu saa sab sac sag sai sao sar sas sat sau sba sbb sbc sbg sbi sbo sbr sbs sbt sbu sca scb scc scg sci sco scr scs sct scu sga sgb sgc sgg sgi sgo sgr sgs sgt sgu sia sib sic sig sii sio sir sis sit siu soa sob soc sog soi soo sor sos sot sou sr- sra srb src srg sri sro srr srs srt ss- ssa ssb ssc ssg ssi sso ssr sss sst ssu sta stb stc stg sti sto str sts stt stu sua sub suc sug sui suo sur sus sut suu taa tab tac tag tai tao tar tas tat tau tba tbb tbc tbg tbi tbo tbr tbs tbt tbu tca tcb tcc tcg tci tco tcr tcs tct tcu tga tgb tgc tgg tgi tgo tgr tgs tgt tgu tia tib tic tig tii tio tir tis tit tiu to- toa tob toc tog toi too tor tos tot tou tra trb trc trg tri tro trr trs trt tru tsa tsb tsc tsg tsi tso tsr tss tst tsu tta ttb ttc ttg tti tto ttr tts ttt ttu tua tub tuc tug tui tuo tur tus tut tuu ua- uaa uab uac uag uai uao uar uas uat uau uba ubb ubc ubg ubi ubo ubr ubs ubt ubu uca ucb ucc ucg uci uco ucr ucs uct ucu uga ugb ugc ugg ugi ugo ugr ugs ugt ugu uia uib uic uig uii uio uir uis uit uiu uoa uob uoc uog uoo uor uos uot ur- ura urb urc urg uri uro urr urs urt uru usa usb usc usg usi uso usr uss ust usu uta utb