-ic a-a a-b a-c a-i a-t aaa aab aac aaf aai aan aar aas aat ab- aba abb abc abf abi abn abr abs abt ac- aca acb acc acf aci acn acr acs act af- afa afb afc aff afi afn afr afs aft ai- aia aib aic aif aii ain air ais ait an- ana anb anc anf ani ann anr ans ant ar- ara arb arc arf ari arn arr ars art as- asa asb asc asf asi asn asr ass ast at- ata atb atc atf ati atn atr ats att baa bab bac baf bai ban bar bas bat bba bbb bbc bbf bbi bbn bbr bbs bbt bca bcb bcc bcf bci bcn bcr bcs bct bfa bfb bfc bff bfi bfn bfr bfs bft bi- bia bib bic bif bii bin bir bis bit bna bnb bnc bnf bni bnn bnr bns bnt bra brb brf bri brn brr brs brt bsa bsb bsc bsf bsi bsn bsr bss bst bta btb btc btf bti btn btr bts btt c-- caa cab cac caf cai can car cas cat cba cbb cbc cbf cbi cbn cbr cbs cbt cca ccb ccc ccf cci ccn ccr ccs cct cfa cfb cfc cff cfi cfn cfr cfs cft ci- cia cib cic cif cii cin cir cis cit cn- cna cnb cnc cnf cni cnn cnr cns cnt cra crb crc crf cri crn crr crs crt csa csb csc csf csi csn csr css cst cta ctb ctc ctf cti ctn ctr cts ctt faa fab fac faf fai fan far fas fat fba fbb fbc fbf fbi fbn fbr fbs fbt fca fcb fcc fcf fci fcn fcr fcs fct ffa ffc fff ffi ffn ffr ffs fft fia fib fic fif fii fin fir fis fit fna fnb fnc fnf fni fnn fnr fns fnt fra frb frc frf fri frn frr frs frt fsa fsb fsc fsf fsi fsn fsr fss fst fta ftb ftc ftf fti ftn ftr fts ftt i-f ia- iaa iab iac iaf iai ian iar ias iat iba ibb ibc ibf ibi ibn ibr ibs ibt ica icb icc icf ici icn icr ics ict ifa ifb ifc iff ifi ifn ifr ifs ift iia iib iic iif iii iin iir iis iit in- ina inb inc inf ini inn inr ins int ir- ira irb irc irf iri irn irr irs irt is- isa isb isc isf isi isn isr iss ist ita itb itc itf iti itn its itt n-i naa nab nac naf nai nan nar nas nat nba nbb nbc nbf nbi nbn nbr nbs nbt nca ncb ncc ncf nci ncn ncr ncs nct nfa nfb nfc nff nfi nfn nfr nfs nft nia nib nic nif nii nin nir nis nit nna nnb nnc nnf nni nnn nns nnt nra nrb nrc nrf nri nrn nrr nrs nrt nsa nsb nsc nsf nsi nsn nsr nss nst nta ntb ntc ntf nti ntn ntr nts ntt ra- raa rab rac raf rai ran rar ras rat rba rbb rbc rbf rbi rbn rbr rbs rbt rca rcb rcc rcf rci rcn rcr rcs rct rfa rfb rfc rff rfi rfn rfr rfs rft ria rib ric rif rii rin rir ris rit rna rnb rnc rni rnn rnr rns rnt rra rrb rrc rrf rri rrn rrr rrs rrt rsa rsb rsc rsf rsi rsn rsr rss rst rta rtb rtc rtf rti rtn rtr rts rtt saa sab sac saf sai san sar sas sat sba sbb sbc sbf sbi sbn sbr sbs sbt sca scb scc scf sci scn scr scs sct sfa sfb sfc sff sfi sfn sfr sfs sft sia sib sic sif sii sin sir sis sit sna snb snc snf sni snn snr sns snt sr- sra srb src srf sri srn srr srs srt ss- ssa ssb ssc ssf ssi ssn ssr sss sst sta stb stc stf sti stn str sts stt taa tab tac taf tai tan tar tas tat tba tbb tbc tbf tbi tbn tbr tbs tbt tca tcb tcc tcf tci tcn tcr tcs tct tfa tfb tfc tff tfi tfn tfr tfs tft tia tib tic tif tii tin tir tis tit tna tnb tnc tnf tni tnn tnr tns tnt tra trb trc trf tri trn trr trs trt tsa tsb tsc tsf tsi tsn tsr tss tst tta ttb ttc ttf tti ttn ttr tts ttt