-ic a-a a-b a-c a-i a-t aaa aab aac aai aak aan aar aat ab- aba abb abc abi abk abn abr abt ac- aca acb acc aci ack acn acr act ai- aia aib aic aii aik ain air ait aka akb akc aki akk akn akr an- ana anb anc ani ank ann anr ant ar- ara arb arc ari ark arn arr art at- ata atb atc ati atn atr att baa bab bac bai bak ban bar bat bba bbb bbc bbi bbk bbn bbr bbt bca bcb bcc bci bck bcn bcr bct bi- bia bib bic bii bik bin bir bit bka bkb bkc bkk bkn bkr bkt bna bnb bnc bni bnk bnn bnr bnt bra brb bri brk brn brr brt bta btb btc bti btk btn btr btt c-- caa cab cac cai cak can car cat cba cbb cbc cbi cbk cbn cbr cbt cca ccb ccc cci cck ccn ccr cct ci- cia cib cic cii cik cin cir cit cka ckb ckc cki ckt cn- cna cnb cnc cni cnn cnr cnt cra crb crc cri crk crn crr crt cta ctb ctc cti ctk ctn ctr ctt ia- iaa iab iac iai ian iar iat iba ibb ibc ibi ibk ibn ibr ibt ica icb icc ici ick icn icr ict iia iib iic iii iin iir iit ika ikb ikc iki ikk ikr ikt in- ina inb inc ini ink inn inr int ir- ira irb irc iri irk irn irr irt ita itb itc iti itk itn itt k-t ka- kaa kab kac kai kak kan kar kat kba kbb kbc kbi kbk kbn kbr kca kcb kcc kci kck kcn kcr kct kia kib kic kii kik kin kir kit kkb kkc kki kkk kkn kkr kkt kn- kna knc kni knk knn knr knt kra krc kri krk krn krr krt kta ktb ktc ktk ktn ktr ktt n-i naa nab nac nai nak nan nar nat nba nbb nbc nbi nbk nbn nbr nbt nca ncb ncc nci nck ncn ncr nct nia nib nic nii nik nin nir nit nka nkc nki nkk nkn nkr nkt nna nnb nnc nni nnk nnn nnt nra nrb nrc nri nrk nrn nrr nrt nta ntb ntc nti ntk ntn ntr ntt ra- raa rab rac rai rak ran rar rat rba rbb rbc rbi rbk rbn rbr rbt rca rcb rcc rci rcn rcr rct ria rib ric rii rik rin rir rit rkb rkc rkk rkt rna rnb rnc rni rnn rnr rnt rra rrb rrc rri rrk rrn rrr rrt rta rtb rtc rti rtk rtn rtr rtt taa tab tac tai tak tan tar tat tba tbb tbc tbi tbk tbn tbr tbt tca tcb tcc tci tck tcn tcr tct tia tib tic tii tik tin tir tit tka tkb tkc tkk tkr tkt tna tnb tnc tni tnk tnn tnr tnt tra trb trc tri trk trn trr trt tta ttb ttc tti ttk ttn ttr ttt