a-a a-b a-i aaa aab aad aae aai aao aas ab- aba abb abd abe abi abo abs ad- ada adb add ade adi ado ads aea aeb aed aee aei aeo aes ai- aia aib aid aie aii aio ais aoa aob aod aoe aoi aoo aos as- asa asb asd ase asi aso ass baa bab bad bae bai bao bas bba bbb bbd bbe bbi bbo bbs bda bdb bdd bde bdi bdo bds be- bea beb bed bee bei beo bes bi- bia bib bid bie bii bio bis boa bob bod boe boi boo bos bsa bsb bsd bse bsi bso bss daa dab dad dae dai dao das dba dbb dbd dbe dbi dbo dbs dda ddb ddd dde ddi ddo dds de- dea deb ded dee dei deo des di- dia dib did die dii dio dis doa dob dod doe doi doo dos dsa dsb dsd dse dsi dso dss eaa eab ead eae eai eao eas eba ebb ebd ebe ebi ebo ebs ed- eda edb edd ede edi edo eds eea eeb eed eee eeo ees eia eib eid eie eii eio eis eo- eoa eob eod eoe eoi eoo eos es- esa esb esd ese esi eso ess i-d ia- iaa iab iad iae iai iao ias iba ibb ibd ibe ibi ibo ibs ida idb idd ide idi ido ids ie- iea ied iee iei ies iia iib iid iie iii iio iis io- ioa iob iod ioe ioi ioo ios is- isa isb isd ise isi iso iss o-i oaa oab oad oae oai oao oas ob- oba obb obd obe obi obo obs oda odb odd ode odi odo ods oea oeb oed oee oei oeo oes oia oib oid oie oii oio ois oo- ooa oob ood ooi ooo oos os- osa osb osd ose osi oso oss saa sab sad sae sai sao sas sba sbb sbd sbe sbi sbo sbs sda sdb sdd sde sdi sdo sds se- sea seb sed see sei seo ses sia sib sid sie sii sio sis soa sob sod soe soi soo sos ss- ssa ssb ssd sse ssi sso sss