-ic a-a a-b a-c a-i aaa aab aac aag aai aar aas aau ab- aba abb abc abg abi abr abs abu ac- aca acb acc acg aci acr acs acu ag- aga agb agc agg agi agr ags agu ai- aia aib aic aig aii air ais aiu ar- ara arb arc arg ari arr ars aru as- asa asb asc asg asi asr ass asu au- aua aub auc aug aui aur aus b-u baa bab bac bag bai bar bas bau bba bbb bbc bbg bbi bbr bbs bbu bca bcb bcc bcg bci bcr bcs bcu bga bgb bgc bgg bgi bgr bgs bgu bi- bia bib bic big bii bir bis biu bra brb brg bri brr brs bru bsa bsb bsc bsg bsi bsr bss bsu bua bub buc bug bui bur bus buu c-- caa cab cac cag cai car cas cau cba cbb cbc cbg cbi cbr cbs cbu cca ccb ccc ccg cci ccr ccs ccu cga cgb cgc cgg cgi cgr cgs cgu ci- cia cib cic cig cii cir cis ciu cra crb crc crg cri crr crs cru csa csb csc csg csi csr css csu cua cub cuc cug cui cur cus cuu gaa gab gac gag gai gar gas gau gba gbc gbg gbi gbr gbs gbu gca gcb gcc gcg gci gcr gcs gcu gga ggb ggc ggg ggi ggr ggs ggu gia gib gic gig gii gir gis giu gra grb grc grg gri grr grs gru gsa gsb gsc gsg gsi gsr gss gsu gu- gua gub guc gug gui gur gus guu ia- iaa iab iac iag iai iar ias iau iba ibb ibc ibg ibi ibr ibs ibu ica icb icc icg ici icr ics icu iga igb igc igg igi igr igs igu iia iib iic iii iir iis iiu ir- ira irb irc irg iri irr irs iru is- isa isb isc isg isi isr iss isu iu- iua iub iuc iug iui iur ius ra- raa rab rac rag rai rar ras rau rba rbb rbc rbg rbi rbr rbs rbu rca rcb rcc rcg rci rcr rcs rcu rga rgb rgc rgg rgi rgr rgs ria rib ric rig rii rir ris rra rrb rrc rrg rri rrr rrs rru rsa rsb rsc rsg rsi rsr rss rsu rua rub ruc rug rui rur rus ruu saa sab sac sag sai sar sas sau sba sbb sbc sbg sbi sbr sbs sbu sca scb scc scg sci scr scs scu sga sgb sgc sgg sgi sgr sgs sgu sia sib sic sig sii sir sis siu sr- sra srb src srg sri srr srs ss- ssa ssb ssc ssg ssi ssr sss ssu sua sub suc sug sui sur sus suu ua- uaa uab uac uag uai uar uas uau uba ubb ubc ubg ubi ubr ubs ubu uca ucb ucc ucg uci ucr ucs ucu uga ugb ugc ugg ugi ugr ugs ugu uia uib uic uig uii uir uis uiu ur- ura urb urc urg uri urr urs uru usa usb usc usg usi usr uss usu uua uuc uug uur uus uuu