-ic bbb bbc bbe bbi bbn bcb bcc bce bci bcn be- beb bec bee bei ben bi- bib bic bie bii bin bnb bnc bne bni bnn c-- cbb cbc cbe cbi cbn ccb ccc cce cci ccn ce- ceb cec cee cei cen ci- cib cic cie cii cin cn- cnb cnc cne cni cnn ebb ebc ebe ebi ebn ec- ecb ecc ece eci ecn eeb eec eee een eib eic eie eii ein en- enb enc ene eni enn ibb ibc ibe ibi ibn icb icc ice ici icn ie- iec iee iei ien iib iic iie iii iin in- inb inc ine ini inn n-i nbb nbc nbe nbi nbn ncb ncc nce nci ncn ne- neb nec nee nei nen nib nic nie nii nin nnb nnc nne nni nnn