a-a a-b a-i a-t aaa aab aad aai aar aas aat aau ab- aba abb abd abi abr abs abt abu ad- ada adb add adi adr ads adt adu ai- aia aib aid aii air ais ait aiu ar- ara arb ard ari arr ars art aru as- asa asb asd asi asr ass ast asu at- ata atb atd ati atr ats att atu au- aua aub aud aui aur aus aut b-u baa bab bad bai bar bas bat bau bba bbb bbd bbi bbr bbs bbt bbu bda bdb bdd bdi bdr bds bdt bdu bi- bia bib bid bii bir bis bit biu bra brb brd bri brr brs brt bru bsa bsb bsd bsi bsr bss bst bsu bta btb btd bti btr bts btt btu bua bub bud bui bur bus but buu daa dab dad dai dar das dat dau dba dbb dbd dbi dbr dbs dbt dbu dda ddb ddd ddi ddr dds ddt ddu di- dia dib did dii dir dis dit diu dra drb drd dri drr drs drt dru dsa dsb dsd dsi dsr dss dst dsu dta dtb dtd dti dtr dts dtt dtu dua dub dud dui dur dus dut i-d ia- iaa iab iad iai iar ias iat iau iba ibb ibd ibi ibr ibs ibt ibu ida idb idd idi idr ids idt idu iia iib iid iii iir iis iit iiu ir- ira irb ird iri irr irs irt iru is- isa isb isd isi isr iss ist isu ita itb itd iti its itt itu iu- iua iub iud iui iur ius iut ra- raa rab rad rai rar ras rat rau rba rbb rbd rbi rbr rbs rbt rbu rda rdb rdd rdi rdr rds rdt rdu ria rib rid rii rir ris rit rra rrb rrd rri rrr rrs rrt rru rsa rsb rsd rsi rsr rss rst rsu rta rtb rtd rti rtr rts rtt rtu rua rub rud rui rur rus rut ruu saa sab sad sai sar sas sat sau sba sbb sbd sbi sbr sbs sbt sbu sda sdb sdd sdi sdr sds sdt sdu sia sib sid sii sir sis sit siu sr- sra srb srd sri srr srs srt ss- ssa ssb ssd ssi ssr sss sst ssu sta stb std sti str sts stt stu sua sub sud sui sur sus sut suu taa tab tad tai tar tas tat tau tba tbb tbd tbi tbr tbs tbt tbu tda tdb tdd tdi tdr tds tdt tdu tia tib tid tii tir tis tit tiu tra trb trd tri trr trs trt tru tsa tsb tsd tsi tsr tss tst tsu tta ttb ttd tti ttr tts ttt ttu tua tub tud tui tur tus tut tuu ua- uaa uab uad uai uar uas uat uau uba ubb ubi ubr ubs ubt ubu uda udb udd udi udr uds udt udu uia uib uid uii uir uis uit uiu ur- ura urb urd uri urr urs urt uru usa usb usd usi usr uss ust usu uta utb utd uti utr uts utt utu uua uur uus uut uuu