-ic a-a a-b a-c a-i aaa aab aac aai aar aas aau aay ab- aba abb abc abi abr abs abu aby ac- aca acb acc aci acr acs acu acy ai- aia aib aic aii air ais aiu aiy ar- ara arb arc ari arr ars aru ary as- asa asb asc asi asr ass asu asy au- aua aub auc aui aur aus ay- aya ayc ayi ayr ays ayu b-u baa bab bac bai bar bas bau bay bba bbb bbc bbi bbr bbs bbu bby bca bcb bcc bci bcr bcs bcu bcy bi- bia bib bic bii bir bis biu biy bra brb bri brr brs bru bry bsa bsb bsc bsi bsr bss bsu bsy bua bub buc bui bur bus buu buy by- bya byc byi byr bys byu c-- caa cab cac cai car cas cau cay cba cbb cbc cbi cbr cbs cbu cby cca ccb ccc cci ccr ccs ccu ci- cia cib cic cii cir cis ciu cra crb crc cri crr crs cru cry csa csb csc csi csr css csu csy cua cub cuc cui cur cus cuu cuy cya cyb cyc cyr cys ia- iaa iab iac iai iar ias iau iba ibb ibc ibi ibr ibs ibu iby ica icb icc ici icr ics icu icy iia iib iic iii iir iis iiu ir- ira irb irc iri irr irs iru iry is- isa isb isc isi isr iss isu isy iu- iua iub iuc iui iur ius iya iyc iyr iys iyy ra- raa rab rac rai rar ras rau ray rba rbb rbc rbi rbr rbs rbu rca rcb rcc rci rcr rcs rcu ria rib ric rii rir ris riy rra rrb rrc rri rrr rrs rru rsa rsb rsc rsi rsr rss rsu rua rub ruc rui rur rus ruu ruy ry- rya ryc ryr rys ryu ryy saa sab sac sai sar sas sau say sba sbb sbc sbi sbr sbs sbu sby sca scb scc sci scr scs scu sia sib sic sii sir sis siu sr- sra srb src sri srr srs sry ss- ssa ssb ssc ssi ssr sss ssu sua sub suc sui sur sus suu suy sy- sya syb syc syi syr sys syu ua- uaa uab uac uai uar uas uau uay uba ubb ubc ubi ubr ubs ubu uby uca ucb ucc uci ucr ucs ucu uia uib uic uii uir uis uiu ur- ura urb urc uri urr urs uru ury usa usb usc usi usr uss usu uua uuc uur uus uuu uyc uyi uys uyu yaa yab yac yai yar yas yau yay ybc ybi ybr ybs yby yca ycc yci ycs ycu ycy yii yir yis yra yrc yrs yru ysa ysb ysc ysi ysr yss ysu ysy yua yui yur yus yuu yuy yyb yyc yys yyu yyy