a-a a-b a-t aaa aab aak aan aar aas aat ab- aba abb abk abn abr abs abt aka akb akk akn akr aks an- ana anb ank ann anr ans ant ar- ara arb ark arn arr ars art as- asa asb ask asn asr ass ast at- ata atb atn atr ats att baa bab bak ban bar bas bat bba bbb bbk bbn bbr bbs bbt bka bkb bkk bkn bkr bks bkt bna bnb bnk bnn bnr bns bnt bra brb brk brn brr brs brt bsa bsb bsk bsn bsr bss bst bta btb btk btn btr bts btt k-t ka- kaa kab kak kan kar kas kat kba kbb kbk kbn kbr kbs kkb kkk kkn kkr kks kkt kn- kna knk knn knr knt kra krk krn krr krs krt ksa ksb ksk ksn ksr kss kst kta ktb ktk ktn ktr kts ktt naa nab nak nan nar nas nat nba nbb nbk nbn nbr nbs nbt nka nkk nkn nkr nks nkt nna nnb nnk nnn nns nnt nra nrb nrk nrn nrr nrs nrt nsa nsb nsk nsn nsr nss nst nta ntb ntk ntn ntr nts ntt ra- raa rab rak ran rar ras rat rba rbb rbk rbn rbr rbs rbt rkb rkk rks rkt rna rnb rnn rnr rns rnt rra rrb rrk rrn rrr rrs rrt rsa rsb rsk rsn rsr rss rst rta rtb rtk rtn rtr rts rtt saa sab sak san sar sas sat sba sbb sbk sbn sbr sbs sbt sk- ska skb skk skr sks skt sna snb snk snn snr sns snt sr- sra srb srk srn srr srs srt ss- ssa ssb ssk ssn ssr sss sst sta stb stk stn str sts stt taa tab tak tan tar tas tat tba tbb tbk tbn tbr tbs tbt tka tkb tkk tkr tks tkt tna tnb tnk tnn tnr tns tnt tra trb trk trn trr trs trt tsa tsb tsk tsn tsr tss tst tta ttb ttk ttn ttr tts ttt