-ic bbb bbc bbe bbi bbk bbn bcb bcc bce bci bck bcn be- beb bec bee bei bek ben bi- bib bic bie bii bik bin bkb bkc bke bkk bkn bnb bnc bne bni bnk bnn c-- cbb cbc cbe cbi cbk cbn ccb ccc cce cci cck ccn ce- ceb cec cee cei cek cen ci- cib cic cie cii cik cin ckb ckc cki cn- cnb cnc cne cni cnn ebb ebc ebe ebi ebk ebn ec- ecb ecc ece eci eck ecn eeb eec eee eek een eib eic eie eii eik ein ekb ekc eke eki en- enb enc ene eni enk enn ibb ibc ibe ibi ibk ibn icb icc ice ici ick icn ie- iec iee iei iek ien iib iic iie iii iin ikb ikc ike iki ikk in- inb inc ine ini ink inn kbb kbc kbe kbi kbk kbn kcb kcc kce kci kck kcn ke- keb kec kee kei kek ken kib kic kie kii kik kin kkb kkc kke kki kkk kkn kn- knc kne kni knk knn n-i nbb nbc nbe nbi nbk nbn ncb ncc nce nci nck ncn ne- neb nec nee nei nek nen nib nic nie nii nik nin nkc nke nki nkk nkn nnb nnc nne nni nnk nnn