-ic a-a a-b a-c a-i aaa aab aac aad aae aai aak ab- aba abb abc abd abe abi abk ac- aca acb acc acd ace aci ack ad- ada adb adc add ade adi adk aea aeb aec aed aee aei aek ai- aia aib aic aid aie aii aik aka akb akc akd ake aki akk baa bab bac bad bae bai bak bba bbb bbc bbd bbe bbi bbk bca bcb bcc bcd bce bci bck bda bdb bdc bdd bde bdi bdk be- bea beb bec bed bee bei bek bi- bia bib bic bid bie bii bik bka bkb bkc bke bkk c-- caa cab cac cad cae cai cak cba cbb cbc cbd cbe cbi cbk cca ccb ccc ccd cce cci cck cda cdb cdc cdd cde cdi cdk ce- cea ceb cec ced cee cei cek ci- cia cib cic cid cie cii cik cka ckb ckc ckd cki daa dab dac dad dae dai dak dba dbb dbc dbd dbe dbi dbk dca dcb dcc dcd dce dci dck dda ddb ddc ddd dde ddi ddk de- dea deb dec ded dee dei dek di- dia dib dic did die dii dik dka dkb dkc dke dki dkk eaa eab eac ead eae eai eak eba ebb ebc ebd ebe ebi ebk ec- eca ecb ecc ecd ece eci eck ed- eda edb edc edd ede edi edk eea eeb eec eed eee eek eia eib eic eid eie eii eik eka ekb ekc ekd eke eki i-d ia- iaa iab iac iad iae iai iba ibb ibc ibd ibe ibi ibk ica icb icc icd ice ici ick ida idb idc idd ide idi idk ie- iea iec ied iee iei iek iia iib iic iid iie iii ika ikb ikc ike iki ikk ka- kaa kab kac kad kae kai kak kba kbb kbc kbd kbe kbi kbk kca kcb kcc kcd kce kci kck kda kdb kdc kde kdk ke- kea keb kec ked kee kei kek kia kib kic kid kie kii kik kkb kkc kke kki kkk