-ic a-a a-b a-c a-i aaa aab aac aad aae aai aao ab- aba abb abc abd abe abi abo ac- aca acb acc acd ace aci aco ad- ada adb adc add ade adi ado aea aeb aec aed aee aei aeo ai- aia aib aic aid aie aii aio aoa aob aoc aod aoe aoi aoo baa bab bac bad bae bai bao bba bbb bbc bbd bbe bbi bbo bca bcb bcc bcd bce bci bco bda bdb bdc bdd bde bdi bdo be- bea beb bec bed bee bei beo bi- bia bib bic bid bie bii bio boa bob boc bod boe boi boo c-- caa cab cac cad cae cai cao cba cbb cbc cbd cbe cbi cbo cca ccb ccc ccd cce cci cco cda cdb cdc cdd cde cdi cdo ce- cea ceb cec ced cee cei ceo ci- cia cib cic cid cie cii cio co- coa cob coc cod coe coi coo daa dab dac dad dae dai dao dba dbb dbc dbd dbe dbi dbo dca dcb dcc dcd dce dci dco dda ddb ddc ddd dde ddi ddo de- dea deb dec ded dee dei deo di- dia dib dic did die dii dio doa dob doc dod doe doi doo eaa eab eac ead eae eai eao eba ebb ebc ebd ebe ebi ebo ec- eca ecb ecc ecd ece eci eco ed- eda edb edc edd ede edi edo eea eeb eec eed eee eeo eia eib eic eid eie eii eio eo- eoa eob eoc eod eoe eoi eoo i-d ia- iaa iab iac iad iae iai iao iba ibb ibc ibd ibe ibi ibo ica icb icc icd ice ici ico ida idb idc idd ide idi ido ie- iea iec ied iee iei iia iib iic iid iie iii iio io- ioa iob ioc iod ioe ioi ioo o-i oaa oab oac oad oae oai oao ob- oba obb obc obd obe obi obo oc- oca ocb occ ocd oci oco oda odb odc odd ode odi odo oea oeb oec oed oee oei oeo oia oib oic oid oie oii oio oo- ooa oob ooc ood ooi ooo