a-a a-b a-i aaa aab aad aae aaf aai aan aao ab- aba abb abd abe abf abi abn abo ad- ada adb add ade adf adi adn ado aea aeb aed aee aef aei aen aeo af- afa afb afd afe aff afi afn afo ai- aia aib aid aie aif aii ain aio an- ana anb and ane anf ani ann ano aoa aob aod aoe aof aoi aon aoo baa bab bad bae baf bai ban bao bba bbb bbd bbe bbf bbi bbn bbo bda bdb bdd bde bdf bdi bdo be- bea beb bed bee bef bei ben beo bfa bfb bfd bfe bff bfi bfn bfo bi- bia bib bid bie bif bii bin bio bna bnb bnd bne bnf bni bnn bno boa bob bod boe bof boi bon boo daa dab dad dae daf dai dan dao dba dbb dbd dbe dbf dbi dbn dbo dda ddb ddd dde ddf ddi ddn ddo de- dea deb ded dee def dei den deo dfa dfb dfd dfe dff dfi dfn dfo di- dia dib did die dif dii din dio dna dnb dnd dne dnf dni dnn dno doa dob dod doe dof doi don doo eaa eab ead eae eaf eai ean eao eba ebb ebd ebe ebf ebi ebn ebo ed- eda edb edd ede edf edi edn edo eea eeb eed eee eef een eeo ef- efa efb efd efe eff efi efo eia eib eid eie eif eii ein eio en- ena enb end ene enf eni enn eno eo- eoa eob eod eoe eof eoi eon eoo faa fab fad fae faf fai fan fao fba fbb fbd fbe fbf fbi fbn fbo fda fdb fdd fde fdf fdi fdn fdo fea feb fed fee fef fei fen feo ffa ffd ffe fff ffi ffn ffo fia fib fid fie fif fii fin fna fnb fnd fne fnf fni fnn foa fob foe fof foi fon foo i-d i-f ia- iaa iab iad iae iaf iai ian iao iba ibb ibd ibe ibf ibi ibn ibo ida idb idd ide idf idi idn ido ie- iea ied iee ief iei ien ifa ifb ifd ife iff ifi ifn ifo iia iib iid iie iif iii iin iio in- ina inb ind ine inf ini inn ino io- ioa iob iod ioe iof ioi ion ioo n-i naa nab nad nae naf nai nan nao nba nbb nbd nbe nbf nbi nbn nbo nda ndb ndd nde ndf ndi ndn ndo ne- nea neb ned nee nef nei nen neo nfa nfb nfd nfe nff nfi nfn nfo nia nib nid nie nif nii nin nio nna nnb nne nnf nni nnn nno no- noa nob nod noe nof noi non noo o-i oaa oab oad oae oaf oai oan oao ob- oba obb obd obe obf obi obn obo oda odb odd ode odf odi odn odo oea oeb oed oee oef oei oen oeo of- ofa ofb ofd ofe off ofi ofn ofo oia oib oid oie oif oii oin oio on- ona onb ond one onf oni onn ono oo- ooa oob ood oof ooi oon ooo