-ic a-a a-b a-c a-i aaa aab aac aad aaf aai ab- aba abb abc abd abf abi ac- aca acb acc acd acf aci ad- ada adb adc add adf adi af- afa afb afc afd aff afi ai- aia aib aic aid aif aii baa bab bac bad baf bai bba bbb bbc bbd bbf bbi bca bcb bcc bcd bcf bci bda bdb bdc bdd bdf bdi bfa bfb bfc bfd bff bfi bi- bia bib bic bid bif bii c-- caa cab cac cad caf cai cba cbb cbc cbd cbf cbi cca ccb ccc ccd ccf cci cda cdb cdc cdd cdf cdi cfa cfb cfc cfd cff cfi ci- cia cib cic cid cif cii daa dab dac dad daf dai dba dbb dbc dbd dbf dbi dca dcb dcc dcd dcf dci dda ddb ddc ddd ddf ddi dfa dfb dfc dfd dff dfi di- dia dib dic did dif dii faa fab fac fad faf fai fba fbb fbc fbd fbf fbi fca fcb fcc fcd fcf fci fda fdb fdc fdd fdf fdi ffa ffc ffd fff ffi fia fib fic fid fif fii i-d i-f ia- iaa iab iac iad iaf iai iba ibb ibc ibd ibf ibi ica icb icc icd icf ici ida idb idc idd idf idi ifa ifb ifc ifd iff ifi iia iib iic iid iif iii