-ic bbb bbc bbd bbe bbi bbn bcb bcc bcd bce bci bcn bdb bdc bdd bde bdi be- beb bec bed bee bei ben bi- bib bic bid bie bii bin bnb bnc bnd bne bni bnn c-- cbb cbc cbd cbe cbi cbn ccb ccc ccd cce cci ccn cdb cdc cdd cde cdi cdn ce- ceb cec ced cee cei cen ci- cib cic cid cie cii cin cn- cnb cnc cnd cne cni cnn dbb dbc dbd dbe dbi dbn dcb dcc dcd dce dci dcn ddb ddc ddd dde ddi ddn de- deb dec ded dee dei den di- dib dic did die dii din dnb dnc dnd dne dni dnn ebb ebc ebd ebe ebi ebn ec- ecb ecc ecd ece eci ecn ed- edb edc edd ede edi edn eeb eec eed eee een eib eic eid eie eii ein en- enb enc end ene eni enn i-d ibb ibc ibd ibe ibi ibn icb icc icd ice ici icn idb idc idd ide idi idn ie- iec ied iee iei ien iib iic iid iie iii iin in- inb inc ind ine ini inn n-i nbb nbc nbd nbe nbi nbn ncb ncc ncd nce nci ncn ndb ndc ndd nde ndi ndn ne- neb nec ned nee nei nen nib nic nid nie nii nin nnb nnc nne nni nnn