a-a a-b a-i aaa aab aad aae aaf aai aao ab- aba abb abd abe abf abi abo ad- ada adb add ade adf adi ado aea aeb aed aee aef aei aeo af- afa afb afd afe aff afi afo ai- aia aib aid aie aif aii aio aoa aob aod aoe aof aoi aoo baa bab bad bae baf bai bao bba bbb bbd bbe bbf bbi bbo bda bdb bdd bde bdf bdi bdo be- bea beb bed bee bef bei beo bfa bfb bfd bfe bff bfi bfo bi- bia bib bid bie bif bii bio boa bob bod boe bof boi boo daa dab dad dae daf dai dao dba dbb dbd dbe dbf dbi dbo dda ddb ddd dde ddf ddi ddo de- dea deb ded dee def dei deo dfa dfb dfd dfe dff dfi dfo di- dia dib did die dif dii dio doa dob dod doe dof doi doo eaa eab ead eae eaf eai eao eba ebb ebd ebe ebf ebi ebo ed- eda edb edd ede edf edi edo eea eeb eed eee eef eeo ef- efa efb efd efe eff efi efo eia eib eid eie eif eii eio eo- eoa eob eod eoe eof eoi eoo faa fab fad fae faf fai fao fba fbb fbd fbe fbf fbi fbo fda fdb fdd fde fdf fdi fdo fea feb fed fee fef fei feo ffa ffd ffe fff ffi ffo fia fib fid fie fif fii foa fob foe fof foi foo i-d i-f ia- iaa iab iad iae iaf iai iao iba ibb ibd ibe ibf ibi ibo ida idb idd ide idf idi ido ie- iea ied iee ief iei ifa ifb ifd ife iff ifi ifo iia iib iid iie iif iii iio io- ioa iob iod ioe iof ioi ioo o-i oaa oab oad oae oaf oai oao ob- oba obb obd obe obf obi obo oda odb odd ode odf odi odo oea oeb oed oee oef oei oeo of- ofa ofb ofd ofe off ofi ofo oia oib oid oie oif oii oio oo- ooa oob ood oof ooi ooo