-ic a-a a-b a-c a-i aaa aab aac aae aaf aai ab- aba abb abc abe abf abi ac- aca acb acc ace acf aci aea aeb aec aee aef aei af- afa afb afc afe aff afi ai- aia aib aic aie aif aii baa bab bac bae baf bai bba bbb bbc bbe bbf bbi bca bcb bcc bce bcf bci be- bea beb bec bee bef bei bfa bfb bfc bfe bff bfi bi- bia bib bic bie bif bii c-- caa cab cac cae caf cai cba cbb cbc cbe cbf cbi cca ccb ccc cce ccf cci ce- cea ceb cec cee cef cei cfa cfb cfc cfe cff cfi ci- cia cib cic cie cif cii eaa eab eac eae eaf eai eba ebb ebc ebe ebf ebi ec- eca ecb ecc ece ecf eci eea eeb eec eee eef ef- efa efb efc efe eff efi eia eib eic eie eif eii faa fab fac fae faf fai fba fbb fbc fbe fbf fbi fca fcb fcc fce fcf fci fea feb fec fee fef fei ffa ffc ffe fff ffi fia fib fic fie fif fii i-f ia- iaa iab iac iae iaf iai iba ibb ibc ibe ibf ibi ica icb icc ice icf ici ie- iea iec iee ief iei ifa ifb ifc ife iff ifi iia iib iic iie iif iii