-ic a-a a-b a-c a-i aaa aab aac aad aae aaf aai aak aao ab- aba abb abc abd abe abf abi abk abo ac- aca acb acc acd ace acf aci ack aco ad- ada adb adc add ade adf adi adk ado aea aeb aec aed aee aef aei aek aeo af- afa afb afc afd afe aff afi afk afo ai- aia aib aic aid aie aif aii aik aio aka akb akc akd ake aki akk ako aoa aob aoc aod aoe aof aoi aok aoo baa bab bac bad bae baf bai bak bao bba bbb bbc bbd bbe bbf bbi bbk bbo bca bcb bcc bcd bce bcf bci bck bco bda bdb bdc bdd bde bdf bdi bdk bdo be- bea beb bec bed bee bef bei bek beo bfa bfb bfc bfd bfe bff bfi bfo bi- bia bib bic bid bie bif bii bik bio bka bkb bkc bke bkf bkk bko boa bob boc bod boe bof boi bok boo c-- caa cab cac cad cae caf cai cak cao cba cbb cbc cbd cbe cbf cbi cbk cbo cca ccb ccc ccd cce ccf cci cck cco cda cdb cdc cdd cde cdf cdi cdk cdo ce- cea ceb cec ced cee cef cei cek ceo cfa cfb cfc cfd cfe cff cfi cfk cfo ci- cia cib cic cid cie cif cii cik cio cka ckb ckc ckd cki cko co- coa cob coc cod coe cof coi cok coo daa dab dac dad dae daf dai dak dao dba dbb dbc dbd dbe dbf dbi dbk dbo dca dcb dcc dcd dce dcf dci dck dco dda ddb ddc ddd dde ddf ddi ddk ddo de- dea deb dec ded dee def dei dek deo dfa dfb dfc dfd dfe dff dfi dfk dfo di- dia dib dic did die dif dii dik dio dka dkb dkc dke dki dkk dko doa dob doc dod doe dof doi dok doo eaa eab eac ead eae eaf eai eak eao eba ebb ebc ebd ebe ebf ebi ebk ebo ec- eca ecb ecc ecd ece ecf eci eck eco ed- eda edb edc edd ede edf edi edk edo eea eeb eec eed eee eef eek eeo ef- efa efb efc efd efe eff efi efo eia eib eic eid eie eif eii eik eio eka ekb ekc ekd eke ekf eki eko eo- eoa eob eoc eod eoe eof eoi eok eoo faa fab fac fad fae faf fai fak fao fba fbb fbc fbd fbe fbf fbi fbk fbo fca fcb fcc fcd fce fcf fci fck fco fda fdb fdc fdd fde fdf fdi fdk fdo fea feb fec fed fee fef fei fek feo ffa ffc ffd ffe fff ffi ffk ffo fia fib fic fid fie fif fii fik fka fkb fkc fkf fki fkk foa fob foc foe fof foi fok foo i-d i-f ia- iaa iab iac iad iae iaf iai iao iba ibb ibc ibd ibe ibf ibi ibk ibo ica icb icc icd ice icf ici ick ico ida idb idc idd ide idf idi idk ido ie- iea iec ied iee ief iei iek ifa ifb ifc ifd ife iff ifi ifo iia iib iic iid iie iif iii iio ika ikb ikc ike ikf iki ikk iko io- ioa iob ioc iod ioe iof ioi ioo ka- kaa kab kac kad kae kaf kai kak kao kba kbb kbc kbd kbe kbf kbi kbk kbo kca kcb kcc kcd kce kci kck kda kdb kdc kde kdf kdk kdo ke- kea keb kec ked kee kef kei kek keo kfa kfc kfd kff kfi kfo kia kib kic kid kie kif kii kik kio kkb kkc kke kki kkk koa kob koc kod koe kof koi kok koo o-i oaa oab oac oad oae oaf oai oak oao ob- oba obb obc obd obe obf obi obk obo oc- oca ocb occ ocd ocf oci ock oco oda odb odc odd ode odf odi odo oea oeb oec oed oee oef oei oeo of- ofa ofb ofc ofd ofe off ofi ofo oia oib oic oid oie oif oii oik oio oka okb okc okd oke oki okk oko oo- ooa oob ooc ood oof ooi ook ooo