a-a a-b a-i aaa aab aad aae aai aas ab- aba abb abd abe abi abs ad- ada adb add ade adi ads aea aeb aed aee aei aes ai- aia aib aid aie aii ais as- asa asb asd ase asi ass baa bab bad bae bai bas bba bbb bbd bbe bbi bbs bda bdb bdd bde bdi bds be- bea beb bed bee bei bes bi- bia bib bid bie bii bis bsa bsb bsd bse bsi bss daa dab dad dae dai das dba dbb dbd dbe dbi dbs dda ddb ddd dde ddi dds de- dea deb ded dee dei des di- dia dib did die dii dis dsa dsb dsd dse dsi dss eaa eab ead eae eai eas eba ebb ebd ebe ebi ebs ed- eda edb edd ede edi eds eea eeb eed eee ees eia eib eid eie eii eis es- esa esb esd ese esi ess i-d ia- iaa iab iad iae iai ias iba ibb ibd ibe ibi ibs ida idb idd ide idi ids ie- iea ied iee iei ies iia iib iid iie iii iis is- isa isb isd ise isi iss saa sab sad sae sai sas sba sbb sbd sbe sbi sbs sda sdb sdd sde sdi sds se- sea seb sed see sei ses sia sib sid sie sii sis ss- ssa ssb ssd sse ssi sss