bbb bbd bbe bbi bbs bdb bdd bde bdi bds be- beb bed bee bei bes bi- bib bid bie bii bis bsb bsd bse bsi bss dbb dbd dbe dbi dbs ddb ddd dde ddi dds de- deb ded dee dei des di- dib did die dii dis dsb dsd dse dsi dss ebb ebd ebe ebi ebs ed- edb edd ede edi eds eeb eed eee ees eib eid eie eii eis es- esb esd ese esi ess i-d ibb ibd ibe ibi ibs idb idd ide idi ids ie- ied iee iei ies iib iid iie iii iis is- isb isd ise isi iss sbb sbd sbe sbi sbs sdb sdd sde sdi sds se- seb sed see sei ses sib sid sie sii sis ss- ssb ssd sse ssi sss