-ic a-a a-b a-c a-i a-t aaa aab aac aae aai aan aas aat ab- aba abb abc abe abi abn abs abt ac- aca acb acc ace aci acn acs act aea aeb aec aee aei aen aes aet ai- aia aib aic aie aii ain ais ait an- ana anb anc ane ani ann ans ant as- asa asb asc ase asi asn ass ast at- ata atb atc ate ati atn ats att baa bab bac bae bai ban bas bat bba bbb bbc bbe bbi bbn bbs bbt bca bcb bcc bce bci bcn bcs bct be- bea beb bec bee bei ben bes bet bi- bia bib bic bie bii bin bis bit bna bnb bnc bne bni bnn bns bnt bsa bsb bsc bse bsi bsn bss bst bta btb btc bte bti btn bts btt c-- caa cab cac cae cai can cas cat cba cbb cbc cbe cbi cbn cbs cbt cca ccb ccc cce cci ccn ccs cct ce- cea ceb cec cee cei cen ces cet ci- cia cib cic cie cii cin cis cit cn- cna cnb cnc cne cni cnn cns cnt csa csb csc cse csi csn css cst cta ctb ctc cte cti ctn cts ctt eaa eab eac eae eai ean eas eat eba ebb ebc ebe ebi ebn ebs ebt ec- eca ecb ecc ece eci ecn ecs ect eea eeb eec eee een ees eet eia eib eic eie eii ein eis eit en- ena enb enc ene eni enn ens ent es- esa esb esc ese esi esn ess est eta etb etc ete eti etn ets ett ia- iaa iab iac iae iai ian ias iat iba ibb ibc ibe ibi ibn ibs ibt ica icb icc ice ici icn ics ict ie- iea iec iee iei ien ies iet iia iib iic iie iii iin iis iit in- ina inb inc ine ini inn ins int is- isa isb isc ise isi isn iss ist ita itb itc ite iti itn its itt n-i naa nab nac nae nai nan nas nat nba nbb nbc nbe nbi nbn nbs nbt nca ncb ncc nce nci ncn ncs nct ne- nea neb nec nee nei nen nes net nia nib nic nie nii nin nis nit nna nnb nnc nne nni nnn nns nnt nsa nsb nsc nse nsi nsn nss nst nta ntb ntc nte nti ntn nts ntt saa sab sac sae sai san sas sat sba sbb sbc sbe sbi sbn sbs sbt sca scb scc sce sci scn scs sct se- sea seb sec see sei sen ses set sia sib sic sie sii sin sis sit sna snb snc sne sni snn sns snt ss- ssa ssb ssc sse ssi ssn sss sst sta stb stc ste sti stn sts stt taa tab tac tae tai tan tas tat tba tbb tbc tbe tbi tbn tbs tbt tca tcb tcc tce tci tcn tcs tct te- tea teb tec tee tei ten tes tet tia tib tic tie tii tin tis tit tna tnb tnc tne tni tnn tns tnt tsa tsb tsc tse tsi tsn tss tst tta ttb ttc tte tti ttn tts ttt