a-a a-b a-i a-t aaa aab aai aak aan aao aar aas aat ab- aba abb abi abk abn abo abr abs abt ai- aia aib aii aik ain aio air ais ait aka akb aki akk akn ako akr aks an- ana anb ani ank ann ano anr ans ant aoa aob aoi aok aon aoo aor aos aot ar- ara arb ari ark arn aro arr ars art as- asa asb asi ask asn aso asr ass ast at- ata atb ati atn ato atr ats att baa bab bai bak ban bao bar bas bat bba bbb bbi bbk bbn bbo bbr bbs bbt bi- bia bib bii bik bin bio bir bis bit bka bkb bkk bkn bko bkr bks bkt bna bnb bni bnk bnn bno bnr bns bnt boa bob boi bok bon boo bor bos bot bra brb bri brk brn bro brr brs brt bsa bsb bsi bsk bsn bso bsr bss bst bta btb bti btk btn bto btr bts btt ia- iaa iab iai ian iao iar ias iat iba ibb ibi ibk ibn ibo ibr ibs ibt iia iib iii iin iio iir iis iit ika ikb iki ikk iko ikr iks ikt in- ina inb ini ink inn ino inr ins int io- ioa iob ioi ion ioo ior ios iot ir- ira irb iri irk irn iro irr irs irt is- isa isb isi isk isn iso isr iss ist ita itb iti itk itn ito its itt k-t ka- kaa kab kai kak kan kao kar kas kat kba kbb kbi kbk kbn kbo kbr kbs kia kib kii kik kin kio kir kis kit kkb kki kkk kkn kkr kks kkt kn- kna kni knk knn kno knr knt koa kob koi kok kon koo kor kos kot kra kri krk krn kro krr krs krt ksa ksb ksi ksk ksn kso ksr kss kst kta ktb ktk ktn kto ktr kts ktt n-i naa nab nai nak nan nao nar nas nat nba nbb nbi nbk nbn nbo nbr nbs nbt nia nib nii nik nin nio nir nis nit nka nki nkk nkn nko nkr nks nkt nna nnb nni nnk nnn nno nns nnt no- noa nob noi nok non noo nor nos not nra nrb nri nrk nrn nro nrr nrs nrt nsa nsb nsi nsk nsn nso nsr nss nst nta ntb nti ntk ntn nto ntr nts ntt o-i oaa oab oai oak oan oao oar oas oat ob- oba obb obi obk obn obo obr obs obt oia oib oii oik oin oio oir ois oit oka okb oki okk oko okr oks on- ona onb oni onk onn ono onr ons ont oo- ooa oob ooi ook oon ooo oor oos oot or- ora orb ori ork orn oro orr ors ort os- osa osb osi osk osn oso osr oss ost ot- ota otb oti otk otn oto otr ots ott ra- raa rab rai rak ran rao rar ras rat rba rbb rbi rbk rbn rbo rbr rbs rbt ria rib rii rik rin rio rir ris rit rkb rkk rko rks rkt rna rnb rni rnn rno rnr rns rnt roa rob roi rok ron roo ror ros rot rra rrb rri rrk rrn rrr rrs rrt rsa rsb rsi rsk rsn rso rsr rss rst rta rtb rti rtk rtn rto rtr rts rtt saa sab sai sak san sao sar sas sat sba sbb sbi sbk sbn sbo sbr sbs sbt sia sib sii sik sin sio sir sis sit sk- ska skb ski skk sko skr sks skt sna snb sni snk snn sno snr sns snt soa sob soi sok son soo sor sos sot sr- sra srb sri srk srn sro srr srs srt ss- ssa ssb ssi ssk ssn sso ssr sss sst sta stb sti stk stn sto str sts stt taa tab tai tak tan tao tar tas tat tba tbb tbi tbk tbn tbo tbr tbs tbt tia tib tii tik tin tio tir tis tit tka tkb tkk tko tkr tks tkt tna tnb tni tnk tnn tno tnr tns tnt to- toa tob toi tok ton too tor tos tot tra trb tri trk trn tro trr trs trt tsa tsb tsi tsk tsn tso tsr tss tst tta ttb tti ttk ttn tto ttr tts ttt