-ic a-a a-b a-c a-i aaa aab aac aae aai ab- aba abb abc abe abi ac- aca acb acc ace aci aea aeb aec aee aei ai- aia aib aic aie aii baa bab bac bae bai bba bbb bbc bbe bbi bca bcb bcc bce bci be- bea beb bec bee bei bi- bia bib bic bie bii c-- caa cab cac cae cai cba cbb cbc cbe cbi cca ccb ccc cce cci ce- cea ceb cec cee cei ci- cia cib cic cie cii eaa eab eac eae eai eba ebb ebc ebe ebi ec- eca ecb ecc ece eci eea eeb eec eee eia eib eic eie eii ia- iaa iab iac iae iai iba ibb ibc ibe ibi ica icb icc ice ici ie- iea iec iee iei iia iib iic iie iii