-ic a-a a-b a-c a-i a-t aaa aab aac aai aak aan aar aas aat ab- aba abb abc abi abk abn abr abs abt ac- aca acb acc aci ack acn acr acs act ai- aia aib aic aii aik ain air ais ait aka akb akc aki akk akn akr aks an- ana anb anc ani ank ann anr ans ant ar- ara arb arc ari ark arn arr ars art as- asa asb asc asi ask asn asr ass ast at- ata atb atc ati atn atr ats att baa bab bac bai bak ban bar bas bat bba bbb bbc bbi bbk bbn bbr bbs bbt bca bcb bcc bci bck bcn bcr bcs bct bi- bia bib bic bii bik bin bir bis bit bka bkb bkc bkk bkn bkr bks bkt bna bnb bnc bni bnk bnn bnr bns bnt bra brb bri brk brn brr brs brt bsa bsb bsc bsi bsk bsn bsr bss bst bta btb btc bti btk btn btr bts btt c-- caa cab cac cai cak can car cas cat cba cbb cbc cbi cbk cbn cbr cbs cbt cca ccb ccc cci cck ccn ccr ccs cct ci- cia cib cic cii cik cin cir cis cit cka ckb ckc cki cks ckt cn- cna cnb cnc cni cnn cnr cns cnt cra crb crc cri crk crn crr crs crt csa csb csc csi csk csn csr css cst cta ctb ctc cti ctk ctn ctr cts ctt ia- iaa iab iac iai ian iar ias iat iba ibb ibc ibi ibk ibn ibr ibs ibt ica icb icc ici ick icn icr ics ict iia iib iic iii iin iir iis iit ika ikb ikc iki ikk ikr iks ikt in- ina inb inc ini ink inn inr ins int ir- ira irb irc iri irk irn irr irs irt is- isa isb isc isi isk isn isr iss ist ita itb itc iti itk itn its itt k-t ka- kaa kab kac kai kak kan kar kas kat kba kbb kbc kbi kbk kbn kbr kbs kca kcb kcc kci kck kcn kcr kcs kct kia kib kic kii kik kin kir kis kit kkb kkc kki kkk kkn kkr kks kkt kn- kna knc kni knk knn knr knt kra krc kri krk krn krr krs krt ksa ksb ksc ksi ksk ksn ksr kss kst kta ktb ktc ktk ktn ktr kts ktt n-i naa nab nac nai nak nan nar nas nat nba nbb nbc nbi nbk nbn nbr nbs nbt nca ncb ncc nci nck ncn ncr ncs nct nia nib nic nii nik nin nir nis nit nka nkc nki nkk nkn nkr nks nkt nna nnb nnc nni nnk nnn nns nnt nra nrb nrc nri nrk nrn nrr nrs nrt nsa nsb nsc nsi nsk nsn nsr nss nst nta ntb ntc nti ntk ntn ntr nts ntt ra- raa rab rac rai rak ran rar ras rat rba rbb rbc rbi rbk rbn rbr rbs rbt rca rcb rcc rci rcn rcr rcs rct ria rib ric rii rik rin rir ris rit rkb rkc rkk rks rkt rna rnb rnc rni rnn rnr rns rnt rra rrb rrc rri rrk rrn rrr rrs rrt rsa rsb rsc rsi rsk rsn rsr rss rst rta rtb rtc rti rtk rtn rtr rts rtt saa sab sac sai sak san sar sas sat sba sbb sbc sbi sbk sbn sbr sbs sbt sca scb scc sci sck scn scr scs sct sia sib sic sii sik sin sir sis sit sk- ska skb skc ski skk skr sks skt sna snb snc sni snk snn snr sns snt sr- sra srb src sri srk srn srr srs srt ss- ssa ssb ssc ssi ssk ssn ssr sss sst sta stb stc sti stk stn str sts stt taa tab tac tai tak tan tar tas tat tba tbb tbc tbi tbk tbn tbr tbs tbt tca tcb tcc tci tck tcn tcr tcs tct tia tib tic tii tik tin tir tis tit tka tkb tkc tkk tkr tks tkt tna tnb tnc tni tnk tnn tnr tns tnt tra trb trc tri trk trn trr trs trt tsa tsb tsc tsi tsk tsn tsr tss tst tta ttb ttc tti ttk ttn ttr tts ttt