-ic a-a a-b a-c a-i aaa aab aac aad aaf aai aak aan aao ab- aba abb abc abd abf abi abk abn abo ac- aca acb acc acd acf aci ack acn aco ad- ada adb adc add adf adi adk adn ado af- afa afb afc afd aff afi afk afn afo ai- aia aib aic aid aif aii aik ain aio aka akb akc akd aki akk akn ako an- ana anb anc and anf ani ank ann ano aoa aob aoc aod aof aoi aok aon aoo baa bab bac bad baf bai bak ban bao bba bbb bbc bbd bbf bbi bbk bbn bbo bca bcb bcc bcd bcf bci bck bcn bco bda bdb bdc bdd bdf bdi bdk bdo bfa bfb bfc bfd bff bfi bfn bfo bi- bia bib bic bid bif bii bik bin bio bka bkb bkc bkf bkk bkn bko bna bnb bnc bnd bnf bni bnk bnn bno boa bob boc bod bof boi bok bon boo c-- caa cab cac cad caf cai cak can cao cba cbb cbc cbd cbf cbi cbk cbn cbo cca ccb ccc ccd ccf cci cck ccn cco cda cdb cdc cdd cdf cdi cdk cdn cdo cfa cfb cfc cfd cff cfi cfk cfn cfo ci- cia cib cic cid cif cii cik cin cio cka ckb ckc ckd cki cko cn- cna cnb cnc cnd cnf cni cnn cno co- coa cob coc cod cof coi cok con coo daa dab dac dad daf dai dak dan dao dba dbb dbc dbd dbf dbi dbk dbn dbo dca dcb dcc dcd dcf dci dck dcn dco dda ddb ddc ddd ddf ddi ddk ddn ddo dfa dfb dfc dfd dff dfi dfk dfn dfo di- dia dib dic did dif dii dik din dio dka dkb dkc dki dkk dko dna dnb dnc dnd dnf dni dnk dnn dno doa dob doc dod dof doi dok don doo faa fab fac fad faf fai fak fan fao fba fbb fbc fbd fbf fbi fbk fbn fbo fca fcb fcc fcd fcf fci fck fcn fco fda fdb fdc fdd fdf fdi fdk fdn fdo ffa ffc ffd fff ffi ffk ffn ffo fia fib fic fid fif fii fik fin fka fkb fkc fkf fki fkk fna fnb fnc fnd fnf fni fnk fnn foa fob foc fof foi fok fon foo i-d i-f ia- iaa iab iac iad iaf iai ian iao iba ibb ibc ibd ibf ibi ibk ibn ibo ica icb icc icd icf ici ick icn ico ida idb idc idd idf idi idk idn ido ifa ifb ifc ifd iff ifi ifn ifo iia iib iic iid iif iii iin iio ika ikb ikc ikf iki ikk iko in- ina inb inc ind inf ini ink inn ino io- ioa iob ioc iod iof ioi ion ioo ka- kaa kab kac kad kaf kai kak kan kao kba kbb kbc kbd kbf kbi kbk kbn kbo kca kcb kcc kcd kci kck kcn kda kdb kdc kdf kdk kdo kfa kfc kfd kff kfi kfo kia kib kic kid kif kii kik kin kio kkb kkc kki kkk kkn kn- kna knc knd knf kni knk knn kno koa kob koc kod kof koi kok kon koo n-i naa nab nac nad naf nai nak nan nao nba nbb nbc nbd nbf nbi nbk nbn nbo nca ncb ncc ncd ncf nci nck ncn nco nda ndb ndc ndd ndf ndi ndk ndn ndo nfa nfb nfc nfd nff nfi nfk nfn nfo nia nib nic nid nif nii nik nin nio nka nkc nkf nki nkk nkn nko nna nnb nnc nnf nni nnk nnn nno no- noa nob noc nod nof noi nok non noo o-i oaa oab oac oad oaf oai oak oan oao ob- oba obb obc obd obf obi obk obn obo oc- oca ocb occ ocd ocf oci ock ocn oco oda odb odc odd odf odi odn odo of- ofa ofb ofc ofd off ofi ofn ofo oia oib oic oid oif oii oik oin oio oka okb okc okd oki okk oko on- ona onb onc ond onf oni onk onn ono oo- ooa oob ooc ood oof ooi ook oon ooo