a-a a-b a-t aaa aab aak aar aas aat aau ab- aba abb abk abr abs abt abu aka akb akk akr aks aku ar- ara arb ark arr ars art aru as- asa asb ask asr ass ast asu at- ata atb atr ats att atu au- aua aub auk aur aus aut b-u baa bab bak bar bas bat bau bba bbb bbk bbr bbs bbt bbu bka bkb bkk bkr bks bkt bra brb brk brr brs brt bru bsa bsb bsk bsr bss bst bsu bta btb btk btr bts btt btu bua bub buk bur bus but buu k-t ka- kaa kab kak kar kas kat kau kba kbb kbk kbr kbs kbu kkb kkk kkr kks kkt kku kra krk krr krs krt kru ksa ksb ksk ksr kss kst ksu kta ktb ktk ktr kts ktt ktu kub kuk kur kus kut kuu ra- raa rab rak rar ras rat rau rba rbb rbk rbr rbs rbt rbu rkb rkk rks rkt rku rra rrb rrk rrr rrs rrt rru rsa rsb rsk rsr rss rst rsu rta rtb rtk rtr rts rtt rtu rua rub ruk rur rus rut ruu saa sab sak sar sas sat sau sba sbb sbk sbr sbs sbt sbu sk- ska skb skk skr sks skt sku sr- sra srb srk srr srs srt ss- ssa ssb ssk ssr sss sst ssu sta stb stk str sts stt stu sua sub suk sur sus sut suu taa tab tak tar tas tat tau tba tbb tbk tbr tbs tbt tbu tka tkb tkk tkr tks tkt tra trb trk trr trs trt tru tsa tsb tsk tsr tss tst tsu tta ttb ttk ttr tts ttt ttu tua tub tuk tur tus tut tuu ua- uaa uab uak uar uas uat uau uba ubb ubk ubr ubs ubt ubu uka ukb ukk ukr uku ur- ura urb urk urr urs urt uru usa usb usk usr uss ust usu uta utb utk utr uts utt utu uua uur uus uut uuu