-ic a-a a-b a-c a-i a-t aaa aab aac aad aae aai aas aat ab- aba abb abc abd abe abi abs abt ac- aca acb acc acd ace aci acs act ad- ada adb adc add ade adi ads adt aea aeb aec aed aee aei aes aet ai- aia aib aic aid aie aii ais ait as- asa asb asc asd ase asi ass ast at- ata atb atc atd ate ati ats att baa bab bac bad bae bai bas bat bba bbb bbc bbd bbe bbi bbs bbt bca bcb bcc bcd bce bci bcs bct bda bdb bdc bdd bde bdi bds bdt be- bea beb bec bed bee bei bes bet bi- bia bib bic bid bie bii bis bit bsa bsb bsc bsd bse bsi bss bst bta btb btc btd bte bti bts btt c-- caa cab cac cad cae cai cas cat cba cbb cbc cbd cbe cbi cbs cbt cca ccb ccc ccd cce cci ccs cct cda cdb cdc cdd cde cdi cds cdt ce- cea ceb cec ced cee cei ces cet ci- cia cib cic cid cie cii cis cit csa csb csc csd cse csi css cst cta ctb ctc ctd cte cti cts ctt daa dab dac dad dae dai das dat dba dbb dbc dbd dbe dbi dbs dbt dca dcb dcc dcd dce dci dcs dct dda ddb ddc ddd dde ddi dds ddt de- dea deb dec ded dee dei des det di- dia dib dic did die dii dis dit dsa dsb dsc dsd dse dsi dss dst dta dtb dtc dtd dte dti dts dtt eaa eab eac ead eae eai eas eat eba ebb ebc ebd ebe ebi ebs ebt ec- eca ecb ecc ecd ece eci ecs ect ed- eda edb edc edd ede edi eds edt eea eeb eec eed eee ees eet eia eib eic eid eie eii eis eit es- esa esb esc esd ese esi ess est eta etb etc etd ete eti ets ett i-d ia- iaa iab iac iad iae iai ias iat iba ibb ibc ibd ibe ibi ibs ibt ica icb icc icd ice ici ics ict ida idb idc idd ide idi ids idt ie- iea iec ied iee iei ies iet iia iib iic iid iie iii iis iit is- isa isb isc isd ise isi iss ist ita itb itc itd ite iti its itt saa sab sac sad sae sai sas sat sba sbb sbc sbd sbe sbi sbs sbt sca scb scc scd sce sci scs sct sda sdb sdc sdd sde sdi sds sdt se- sea seb sec sed see sei ses set sia sib sic sid sie sii sis sit ss- ssa ssb ssc ssd sse ssi sss sst sta stb stc std ste sti sts stt taa tab tac tad tae tai tas tat tba tbb tbc tbd tbe tbi tbs tbt tca tcb tcc tcd tce tci tcs tct tda tdb tdc tdd tde tdi tds tdt te- tea teb tec ted tee tei tes tet tia tib tic tid tie tii tis tit tsa tsb tsc tsd tse tsi tss tst tta ttb ttc ttd tte tti tts ttt