-ic a-a a-b a-c a-i aaa aab aac aad aaf aai aas ab- aba abb abc abd abf abi abs ac- aca acb acc acd acf aci acs ad- ada adb adc add adf adi ads af- afa afb afc afd aff afi afs ai- aia aib aic aid aif aii ais as- asa asb asc asd asf asi ass baa bab bac bad baf bai bas bba bbb bbc bbd bbf bbi bbs bca bcb bcc bcd bcf bci bcs bda bdb bdc bdd bdf bdi bds bfa bfb bfc bfd bff bfi bfs bi- bia bib bic bid bif bii bis bsa bsb bsc bsd bsf bsi bss c-- caa cab cac cad caf cai cas cba cbb cbc cbd cbf cbi cbs cca ccb ccc ccd ccf cci ccs cda cdb cdc cdd cdf cdi cds cfa cfb cfc cfd cff cfi cfs ci- cia cib cic cid cif cii cis csa csb csc csd csf csi css daa dab dac dad daf dai das dba dbb dbc dbd dbf dbi dbs dca dcb dcc dcd dcf dci dcs dda ddb ddc ddd ddf ddi dds dfa dfb dfc dfd dff dfi dfs di- dia dib dic did dif dii dis dsa dsb dsc dsd dsf dsi dss faa fab fac fad faf fai fas fba fbb fbc fbd fbf fbi fbs fca fcb fcc fcd fcf fci fcs fda fdb fdc fdd fdf fdi fds ffa ffc ffd fff ffi ffs fia fib fic fid fif fii fis fsa fsb fsc fsd fsf fsi fss i-d i-f ia- iaa iab iac iad iaf iai ias iba ibb ibc ibd ibf ibi ibs ica icb icc icd icf ici ics ida idb idc idd idf idi ids ifa ifb ifc ifd iff ifi ifs iia iib iic iid iif iii iis is- isa isb isc isd isf isi iss saa sab sac sad saf sai sas sba sbb sbc sbd sbf sbi sbs sca scb scc scd scf sci scs sda sdb sdc sdd sdf sdi sds sfa sfb sfc sfd sff sfi sfs sia sib sic sid sif sii sis ss- ssa ssb ssc ssd ssf ssi sss