-ic a-a a-b a-c a-i a-t aaa aab aac aad aai aas aat ab- aba abb abc abd abi abs abt ac- aca acb acc acd aci acs act ad- ada adb adc add adi ads adt ai- aia aib aic aid aii ais ait as- asa asb asc asd asi ass ast at- ata atb atc atd ati ats att baa bab bac bad bai bas bat bba bbb bbc bbd bbi bbs bbt bca bcb bcc bcd bci bcs bct bda bdb bdc bdd bdi bds bdt bi- bia bib bic bid bii bis bit bsa bsb bsc bsd bsi bss bst bta btb btc btd bti bts btt c-- caa cab cac cad cai cas cat cba cbb cbc cbd cbi cbs cbt cca ccb ccc ccd cci ccs cct cda cdb cdc cdd cdi cds cdt ci- cia cib cic cid cii cis cit csa csb csc csd csi css cst cta ctb ctc ctd cti cts ctt daa dab dac dad dai das dat dba dbb dbc dbd dbi dbs dbt dca dcb dcc dcd dci dcs dct dda ddb ddc ddd ddi dds ddt di- dia dib dic did dii dis dit dsa dsb dsc dsd dsi dss dst dta dtb dtc dtd dti dts dtt i-d ia- iaa iab iac iad iai ias iat iba ibb ibc ibd ibi ibs ibt ica icb icc icd ici ics ict ida idb idc idd idi ids idt iia iib iic iid iii iis iit is- isa isb isc isd isi iss ist ita itb itc itd iti its itt saa sab sac sad sai sas sat sba sbb sbc sbd sbi sbs sbt sca scb scc scd sci scs sct sda sdb sdc sdd sdi sds sdt sia sib sic sid sii sis sit ss- ssa ssb ssc ssd ssi sss sst sta stb stc std sti sts stt taa tab tac tad tai tas tat tba tbb tbc tbd tbi tbs tbt tca tcb tcc tcd tci tcs tct tda tdb tdc tdd tdi tds tdt tia tib tic tid tii tis tit tsa tsb tsc tsd tsi tss tst tta ttb ttc ttd tti tts ttt