a-a a-b a-t aaa aab aao aar aas aat aau aay ab- aba abb abo abr abs abt abu aby aoa aob aoo aor aos aot aou ar- ara arb aro arr ars art aru ary as- asa asb aso asr ass ast asu asy at- ata atb ato atr ats att atu au- aua aub auo aur aus aut ay- aya ayo ayr ays ayt ayu b-u baa bab bao bar bas bat bau bay bba bbb bbo bbr bbs bbt bbu bby boa bob boo bor bos bot bou boy bra brb bro brr brs brt bru bry bsa bsb bso bsr bss bst bsu bsy bta btb bto btr bts btt btu bty bua bub buo bur bus but buu buy by- bya byo byr bys byt byu oaa oab oao oar oas oat oau ob- oba obb obo obr obs obt obu oby oo- ooa oob ooo oor oos oot or- ora orb oro orr ors ort oru ory os- osa osb oso osr oss ost osu ot- ota otb oto otr ots ott otu ou- oua ouo our ous out oya oyo oys ra- raa rab rao rar ras rat rau ray rba rbb rbo rbr rbs rbt rbu roa rob roo ror ros rot rou roy rra rrb rrr rrs rrt rru rsa rsb rso rsr rss rst rsu rta rtb rto rtr rts rtt rtu rty rua rub ruo rur rus rut ruu ruy ry- rya ryo ryr rys ryu ryy saa sab sao sar sas sat sau say sba sbb sbo sbr sbs sbt sbu sby soa sob soo sor sos sot sou soy sr- sra srb sro srr srs srt sry ss- ssa ssb sso ssr sss sst ssu sta stb sto str sts stt stu sty sua sub suo sur sus sut suu suy sy- sya syb syr sys syt syu taa tab tao tar tas tat tau tay tba tbb tbo tbr tbs tbt tbu to- toa tob too tor tos tot tou toy tra trb tro trr trs trt tru try tsa tsb tso tsr tss tst tsu tsy tta ttb tto ttr tts ttt ttu tty tua tub tuo tur tus tut tuu tuy tya tyo tyr tys tyt ua- uaa uab uao uar uas uat uau uay uba ubb ubo ubr ubs ubt ubu uby uoa uob uoo uor uos uot ur- ura urb uro urr urs urt uru ury usa usb uso usr uss ust usu uta utb uto utr uts utt utu uty uua uur uus uut uuu uyo uys uyu yaa yab yao yar yas yat yau yay ybr ybs yby yob yoo yor yos yot you yoy yra yro yrs yrt yru ysa ysb yso ysr yss yst ysu ysy yta yto ytr yts ytt ytu yua yuo yur yus yut yuu yuy yyb yys yyt yyu yyy