-ic a-a a-b a-c a-i a-t aaa aab aac aaf aai aar aas aat aay ab- aba abb abc abf abi abr abs abt aby ac- aca acb acc acf aci acr acs act acy af- afa afb afc aff afi afr afs aft afy ai- aia aib aic aif aii air ais ait aiy ar- ara arb arc arf ari arr ars art ary as- asa asb asc asf asi asr ass ast asy at- ata atb atc atf ati atr ats att ay- aya ayc ayf ayi ayr ays ayt baa bab bac baf bai bar bas bat bay bba bbb bbc bbf bbi bbr bbs bbt bby bca bcb bcc bcf bci bcr bcs bct bcy bfa bfb bfc bff bfi bfr bfs bft bfy bi- bia bib bic bif bii bir bis bit biy bra brb brf bri brr brs brt bry bsa bsb bsc bsf bsi bsr bss bst bsy bta btb btc btf bti btr bts btt bty by- bya byc byf byi byr bys byt c-- caa cab cac caf cai car cas cat cay cba cbb cbc cbf cbi cbr cbs cbt cby cca ccb ccc ccf cci ccr ccs cct cfa cfb cfc cff cfi cfr cfs cft ci- cia cib cic cif cii cir cis cit cra crb crc crf cri crr crs crt cry csa csb csc csf csi csr css cst csy cta ctb ctc ctf cti ctr cts ctt cty cya cyb cyc cyf cyr cys cyt faa fab fac faf fai far fas fat fay fba fbb fbc fbf fbi fbr fbs fbt fca fcb fcc fcf fci fcr fcs fct fcy ffa ffc fff ffi ffr ffs fft ffy fia fib fic fif fii fir fis fit fra frb frc frf fri frr frs frt fry fsa fsb fsc fsf fsi fsr fss fst fta ftb ftc ftf fti ftr fts ftt fty fy- fya fyb fyc fyi i-f ia- iaa iab iac iaf iai iar ias iat iba ibb ibc ibf ibi ibr ibs ibt iby ica icb icc icf ici icr ics ict icy ifa ifb ifc iff ifi ifr ifs ift ify iia iib iic iif iii iir iis iit ir- ira irb irc irf iri irr irs irt iry is- isa isb isc isf isi isr iss ist isy ita itb itc itf iti its itt ity iya iyc iyr iys iyt iyy ra- raa rab rac raf rai rar ras rat ray rba rbb rbc rbf rbi rbr rbs rbt rca rcb rcc rcf rci rcr rcs rct rfa rfb rfc rff rfi rfr rfs rft ria rib ric rif rii rir ris rit riy rra rrb rrc rrf rri rrr rrs rrt rsa rsb rsc rsf rsi rsr rss rst rta rtb rtc rtf rti rtr rts rtt rty ry- rya ryc ryf ryr rys ryy saa sab sac saf sai sar sas sat say sba sbb sbc sbf sbi sbr sbs sbt sby sca scb scc scf sci scr scs sct sfa sfb sfc sff sfi sfr sfs sft sia sib sic sif sii sir sis sit sr- sra srb src srf sri srr srs srt sry ss- ssa ssb ssc ssf ssi ssr sss sst sta stb stc stf sti str sts stt sty sy- sya syb syc syi syr sys syt taa tab tac taf tai tar tas tat tay tba tbb tbc tbf tbi tbr tbs tbt tca tcb tcc tcf tci tcr tcs tct tfa tfb tfc tff tfi tfr tfs tft tia tib tic tif tii tir tis tit tiy tra trb trc trf tri trr trs trt try tsa tsb tsc tsf tsi tsr tss tst tsy tta ttb ttc ttf tti ttr tts ttt tty tya tyc tyf tyr tys tyt yaa yab yac yaf yai yar yas yat yay ybc ybf ybi ybr ybs yby yca ycc ycf yci ycs ycy yfa yfc yff yfr yfs yft yif yii yir yis yit yra yrc yrf yrs yrt ysa ysb ysc ysi ysr yss yst ysy yta ytc ytf ytr yts ytt yyb yyc yyf yys yyt yyy