-ic bbb bbc bbe bbi bbk bbn bbt bcb bcc bce bci bck bcn bct be- beb bec bee bei bek ben bet bi- bib bic bie bii bik bin bit bkb bkc bke bkk bkn bkt bnb bnc bne bni bnk bnn bnt btb btc bte bti btk btn btt c-- cbb cbc cbe cbi cbk cbn cbt ccb ccc cce cci cck ccn cct ce- ceb cec cee cei cek cen cet ci- cib cic cie cii cik cin cit ckb ckc cki ckt cn- cnb cnc cne cni cnn cnt ctb ctc cte cti ctk ctn ctt ebb ebc ebe ebi ebk ebn ebt ec- ecb ecc ece eci eck ecn ect eeb eec eee eek een eet eib eic eie eii eik ein eit ekb ekc eke eki ekt en- enb enc ene eni enk enn ent etb etc ete eti etk etn ett ibb ibc ibe ibi ibk ibn ibt icb icc ice ici ick icn ict ie- iec iee iei iek ien iet iib iic iie iii iin iit ikb ikc ike iki ikk ikt in- inb inc ine ini ink inn int itb itc ite iti itk itn itt k-t kbb kbc kbe kbi kbk kbn kcb kcc kce kci kck kcn kct ke- keb kec kee kei kek ken ket kib kic kie kii kik kin kit kkb kkc kke kki kkk kkn kkt kn- knc kne kni knk knn knt ktb ktc kte ktk ktn ktt n-i nbb nbc nbe nbi nbk nbn nbt ncb ncc nce nci nck ncn nct ne- neb nec nee nei nek nen net nib nic nie nii nik nin nit nkc nke nki nkk nkn nkt nnb nnc nne nni nnk nnn nnt ntb ntc nte nti ntk ntn ntt tbb tbc tbe tbi tbk tbn tbt tcb tcc tce tci tck tcn tct te- teb tec tee tei tek ten tet tib tic tie tii tik tin tit tkb tkc tke tkk tkt tnb tnc tne tni tnk tnn tnt ttb ttc tte tti ttk ttn ttt