-ic a-a a-b a-c a-i aaa aab aac aae aaf aai aan ab- aba abb abc abe abf abi abn ac- aca acb acc ace acf aci acn aea aeb aec aee aef aei aen af- afa afb afc afe aff afi afn ai- aia aib aic aie aif aii ain an- ana anb anc ane anf ani ann baa bab bac bae baf bai ban bba bbb bbc bbe bbf bbi bbn bca bcb bcc bce bcf bci bcn be- bea beb bec bee bef bei ben bfa bfb bfc bfe bff bfi bfn bi- bia bib bic bie bif bii bin bna bnb bnc bne bnf bni bnn c-- caa cab cac cae caf cai can cba cbb cbc cbe cbf cbi cbn cca ccb ccc cce ccf cci ccn ce- cea ceb cec cee cef cei cen cfa cfb cfc cfe cff cfi cfn ci- cia cib cic cie cif cii cin cn- cna cnb cnc cne cnf cni cnn eaa eab eac eae eaf eai ean eba ebb ebc ebe ebf ebi ebn ec- eca ecb ecc ece ecf eci ecn eea eeb eec eee eef een ef- efa efb efc efe eff efi eia eib eic eie eif eii ein en- ena enb enc ene enf eni enn faa fab fac fae faf fai fan fba fbb fbc fbe fbf fbi fbn fca fcb fcc fce fcf fci fcn fea feb fec fee fef fei fen ffa ffc ffe fff ffi ffn fia fib fic fie fif fii fin fna fnb fnc fne fnf fni fnn i-f ia- iaa iab iac iae iaf iai ian iba ibb ibc ibe ibf ibi ibn ica icb icc ice icf ici icn ie- iea iec iee ief iei ien ifa ifb ifc ife iff ifi ifn iia iib iic iie iif iii iin in- ina inb inc ine inf ini inn n-i naa nab nac nae naf nai nan nba nbb nbc nbe nbf nbi nbn nca ncb ncc nce ncf nci ncn ne- nea neb nec nee nef nei nen nfa nfb nfc nfe nff nfi nfn nia nib nic nie nif nii nin nna nnb nnc nne nnf nni nnn