-ic a-a a-b a-c a-i aaa aab aac aaf aai aak aan ab- aba abb abc abf abi abk abn ac- aca acb acc acf aci ack acn af- afa afb afc aff afi afk afn ai- aia aib aic aif aii aik ain aka akb akc aki akk akn an- ana anb anc anf ani ank ann baa bab bac baf bai bak ban bba bbb bbc bbf bbi bbk bbn bca bcb bcc bcf bci bck bcn bfa bfb bfc bff bfi bfn bi- bia bib bic bif bii bik bin bka bkb bkc bkf bkk bkn bna bnb bnc bnf bni bnk bnn c-- caa cab cac caf cai cak can cba cbb cbc cbf cbi cbk cbn cca ccb ccc ccf cci cck ccn cfa cfb cfc cff cfi cfk cfn ci- cia cib cic cif cii cik cin cka ckb ckc cki cn- cna cnb cnc cnf cni cnn faa fab fac faf fai fak fan fba fbb fbc fbf fbi fbk fbn fca fcb fcc fcf fci fck fcn ffa ffc fff ffi ffk ffn fia fib fic fif fii fik fin fka fkb fkc fkf fki fkk fna fnb fnc fnf fni fnk fnn i-f ia- iaa iab iac iaf iai ian iba ibb ibc ibf ibi ibk ibn ica icb icc icf ici ick icn ifa ifb ifc iff ifi ifn iia iib iic iif iii iin ika ikb ikc ikf iki ikk in- ina inb inc inf ini ink inn ka- kaa kab kac kaf kai kak kan kba kbb kbc kbf kbi kbk kbn kca kcb kcc kci kck kcn kfa kfc kff kfi kia kib kic kif kii kik kin kkb kkc kki kkk kkn kn- kna knc knf kni knk knn n-i naa nab nac naf nai nak nan nba nbb nbc nbf nbi nbk nbn nca ncb ncc ncf nci nck ncn nfa nfb nfc nff nfi nfk nfn nia nib nic nif nii nik nin nka nkc nkf nki nkk nkn nna nnb nnc nnf nni nnk nnn