-ic bbb bbc bbd bbe bbi bcb bcc bcd bce bci bdb bdc bdd bde bdi be- beb bec bed bee bei bi- bib bic bid bie bii c-- cbb cbc cbd cbe cbi ccb ccc ccd cce cci cdb cdc cdd cde cdi ce- ceb cec ced cee cei ci- cib cic cid cie cii dbb dbc dbd dbe dbi dcb dcc dcd dce dci ddb ddc ddd dde ddi de- deb dec ded dee dei di- dib dic did die dii ebb ebc ebd ebe ebi ec- ecb ecc ecd ece eci ed- edb edc edd ede edi eeb eec eed eee eib eic eid eie eii i-d ibb ibc ibd ibe ibi icb icc icd ice ici idb idc idd ide idi ie- iec ied iee iei iib iic iid iie iii