a-a a-b a-i a-t aaa aab aaf aai aar aas aat aau ab- aba abb abf abi abr abs abt abu af- afa afb aff afi afr afs aft afu ai- aia aib aif aii air ais ait aiu ar- ara arb arf ari arr ars art aru as- asa asb asf asi asr ass ast asu at- ata atb atf ati atr ats att atu au- aua aub auf aui aur aus aut b-u baa bab baf bai bar bas bat bau bba bbb bbf bbi bbr bbs bbt bbu bfa bfb bff bfi bfr bfs bft bfu bi- bia bib bif bii bir bis bit biu bra brb brf bri brr brs brt bru bsa bsb bsf bsi bsr bss bst bsu bta btb btf bti btr bts btt btu bua bub buf bui bur bus but buu faa fab faf fai far fas fat fau fba fbb fbf fbi fbr fbs fbt fbu ffa fff ffi ffr ffs fft ffu fia fib fif fii fir fis fit fiu fra frb frf fri frr frs frt fru fsa fsb fsf fsi fsr fss fst fsu fta ftb ftf fti ftr fts ftt ftu fua fub fuf fui fur fus fut fuu i-f ia- iaa iab iaf iai iar ias iat iau iba ibb ibf ibi ibr ibs ibt ibu ifa ifb iff ifi ifr ifs ift ifu iia iib iif iii iir iis iit iiu ir- ira irb irf iri irr irs irt iru is- isa isb isf isi isr iss ist isu ita itb itf iti its itt itu iu- iua iub iui iur ius iut ra- raa rab raf rai rar ras rat rau rba rbb rbf rbi rbr rbs rbt rbu rfa rfb rff rfi rfr rfs rft rfu ria rib rif rii rir ris rit rra rrb rrf rri rrr rrs rrt rru rsa rsb rsf rsi rsr rss rst rsu rta rtb rtf rti rtr rts rtt rtu rua rub ruf rui rur rus rut ruu saa sab saf sai sar sas sat sau sba sbb sbf sbi sbr sbs sbt sbu sfa sfb sff sfi sfr sfs sft sfu sia sib sif sii sir sis sit siu sr- sra srb srf sri srr srs srt ss- ssa ssb ssf ssi ssr sss sst ssu sta stb stf sti str sts stt stu sua sub suf sui sur sus sut suu taa tab taf tai tar tas tat tau tba tbb tbf tbi tbr tbs tbt tbu tfa tfb tff tfi tfr tfs tft tfu tia tib tif tii tir tis tit tiu tra trb trf tri trr trs trt tru tsa tsb tsf tsi tsr tss tst tsu tta ttb ttf tti ttr tts ttt ttu tua tub tuf tui tur tus tut tuu ua- uaa uab uaf uai uar uas uat uau uba ubb ubf ubi ubr ubs ubt ubu ufa uff ufi ufr ufs uft ufu uia uib uif uii uir uis uit uiu ur- ura urb urf uri urr urs urt uru usa usb usf usi usr uss ust usu uta utb utf uti utr uts utt utu uua uur uus uut uuu