bbb bbd bbe bbi bbk bdb bdd bde bdi bdk be- beb bed bee bei bek bi- bib bid bie bii bik bkb bke bkk dbb dbd dbe dbi dbk ddb ddd dde ddi ddk de- deb ded dee dei dek di- dib did die dii dik dkb dke dki dkk ebb ebd ebe ebi ebk ed- edb edd ede edi edk eeb eed eee eek eib eid eie eii eik ekb ekd eke eki i-d ibb ibd ibe ibi ibk idb idd ide idi idk ie- ied iee iei iek iib iid iie iii ikb ike iki ikk kbb kbd kbe kbi kbk kdb kde kdk ke- keb ked kee kei kek kib kid kie kii kik kkb kke kki kkk