-ic a-a a-b a-c a-i a-t aaa aab aac aai aan aar aas aat ab- aba abb abc abi abn abr abs abt ac- aca acb acc aci acn acr acs act ai- aia aib aic aii ain air ais ait an- ana anb anc ani ann anr ans ant ar- ara arb arc ari arn arr ars art as- asa asb asc asi asn asr ass ast at- ata atb atc ati atn atr ats att baa bab bac bai ban bar bas bat bba bbb bbc bbi bbn bbr bbs bbt bca bcb bcc bci bcn bcr bcs bct bi- bia bib bic bii bin bir bis bit bna bnb bnc bni bnn bnr bns bnt bra brb bri brn brr brs brt bsa bsb bsc bsi bsn bsr bss bst bta btb btc bti btn btr bts btt c-- caa cab cac cai can car cas cat cba cbb cbc cbi cbn cbr cbs cbt cca ccb ccc cci ccn ccr ccs cct ci- cia cib cic cii cin cir cis cit cn- cna cnb cnc cni cnn cnr cns cnt cra crb crc cri crn crr crs crt csa csb csc csi csn csr css cst cta ctb ctc cti ctn ctr cts ctt ia- iaa iab iac iai ian iar ias iat iba ibb ibc ibi ibn ibr ibs ibt ica icb icc ici icn icr ics ict iia iib iic iii iin iir iis iit in- ina inb inc ini inn inr ins int ir- ira irb irc iri irn irr irs irt is- isa isb isc isi isn isr iss ist ita itb itc iti itn its itt n-i naa nab nac nai nan nar nas nat nba nbb nbc nbi nbn nbr nbs nbt nca ncb ncc nci ncn ncr ncs nct nia nib nic nii nin nir nis nit nna nnb nnc nni nnn nns nnt nra nrb nrc nri nrn nrr nrs nrt nsa nsb nsc nsi nsn nsr nss nst nta ntb ntc nti ntn ntr nts ntt ra- raa rab rac rai ran rar ras rat rba rbb rbc rbi rbn rbr rbs rbt rca rcb rcc rci rcn rcr rcs rct ria rib ric rii rin rir ris rit rna rnb rnc rni rnn rnr rns rnt rra rrb rrc rri rrn rrr rrs rrt rsa rsb rsc rsi rsn rsr rss rst rta rtb rtc rti rtn rtr rts rtt saa sab sac sai san sar sas sat sba sbb sbc sbi sbn sbr sbs sbt sca scb scc sci scn scr scs sct sia sib sic sii sin sir sis sit sna snb snc sni snn snr sns snt sr- sra srb src sri srn srr srs srt ss- ssa ssb ssc ssi ssn ssr sss sst sta stb stc sti stn str sts stt taa tab tac tai tan tar tas tat tba tbb tbc tbi tbn tbr tbs tbt tca tcb tcc tci tcn tcr tcs tct tia tib tic tii tin tir tis tit tna tnb tnc tni tnn tnr tns tnt tra trb trc tri trn trr trs trt tsa tsb tsc tsi tsn tsr tss tst tta ttb ttc tti ttn ttr tts ttt