-ic a-a a-b a-c a-i a-t aaa aab aac aaf aai aan aar aat ab- aba abb abc abf abi abn abr abt ac- aca acb acc acf aci acn acr act af- afa afb afc aff afi afn afr aft ai- aia aib aic aif aii ain air ait an- ana anb anc anf ani ann anr ant ar- ara arb arc arf ari arn arr art at- ata atb atc atf ati atn atr att baa bab bac baf bai ban bar bat bba bbb bbc bbf bbi bbn bbr bbt bca bcb bcc bcf bci bcn bcr bct bfa bfb bfc bff bfi bfn bfr bft bi- bia bib bic bif bii bin bir bit bna bnb bnc bnf bni bnn bnr bnt bra brb brf bri brn brr brt bta btb btc btf bti btn btr btt c-- caa cab cac caf cai can car cat cba cbb cbc cbf cbi cbn cbr cbt cca ccb ccc ccf cci ccn ccr cct cfa cfb cfc cff cfi cfn cfr cft ci- cia cib cic cif cii cin cir cit cn- cna cnb cnc cnf cni cnn cnr cnt cra crb crc crf cri crn crr crt cta ctb ctc ctf cti ctn ctr ctt faa fab fac faf fai fan far fat fba fbb fbc fbf fbi fbn fbr fbt fca fcb fcc fcf fci fcn fcr fct ffa ffc fff ffi ffn ffr fft fia fib fic fif fii fin fir fit fna fnb fnc fnf fni fnn fnr fnt fra frb frc frf fri frn frr frt fta ftb ftc ftf fti ftn ftr ftt i-f ia- iaa iab iac iaf iai ian iar iat iba ibb ibc ibf ibi ibn ibr ibt ica icb icc icf ici icn icr ict ifa ifb ifc iff ifi ifn ifr ift iia iib iic iif iii iin iir iit in- ina inb inc inf ini inn inr int ir- ira irb irc irf iri irn irr irt ita itb itc itf iti itn itt n-i naa nab nac naf nai nan nar nat nba nbb nbc nbf nbi nbn nbr nbt nca ncb ncc ncf nci ncn ncr nct nfa nfb nfc nff nfi nfn nfr nft nia nib nic nif nii nin nir nit nna nnb nnc nnf nni nnn nnt nra nrb nrc nrf nri nrn nrr nrt nta ntb ntc ntf nti ntn ntr ntt ra- raa rab rac raf rai ran rar rat rba rbb rbc rbf rbi rbn rbr rbt rca rcb rcc rcf rci rcn rcr rct rfa rfb rfc rff rfi rfn rfr rft ria rib ric rif rii rin rir rit rna rnb rnc rni rnn rnr rnt rra rrb rrc rrf rri rrn rrr rrt rta rtb rtc rtf rti rtn rtr rtt taa tab tac taf tai tan tar tat tba tbb tbc tbf tbi tbn tbr tbt tca tcb tcc tcf tci tcn tcr tct tfa tfb tfc tff tfi tfn tfr tft tia tib tic tif tii tin tir tit tna tnb tnc tnf tni tnn tnr tnt tra trb trc trf tri trn trr trt tta ttb ttc ttf tti ttn ttr ttt