-ic bbb bbc bbi bbk bbl bbn bcb bcc bci bck bcl bcn bi- bib bic bii bik bil bin bkb bkc bkk bkl bkn blb blc bli blk bll bln bnb bnc bni bnk bnl bnn c-- cbb cbc cbi cbk cbl cbn ccb ccc cci cck ccl ccn ci- cib cic cii cik cil cin ckb ckc cki cl- clb clc cli clk cll cln cn- cnb cnc cni cnl cnn ibb ibc ibi ibk ibl ibn icb icc ici ick icl icn iib iic iii iil iin ikb ikc iki ikk ikl il- ilb ilc ili ilk ill iln in- inb inc ini ink inl inn kbb kbc kbi kbk kbl kbn kcb kcc kci kck kcl kcn kib kic kii kik kil kin kkb kkc kki kkk kkl kkn kl- klb klc kli kn- knc kni knk knl knn lbb lbc lbi lbk lbl lcb lcc lci lck lcl lcn lib lic lii lik lil lin lkb lkl llb llc lli llk lll lln lnb lnc lni lnk lnl lnn n-i nbb nbc nbi nbk nbl nbn ncb ncc nci nck ncl ncn nib nic nii nik nil nin nkc nki nkk nkn nlb nlc nli nlk nll nln nnb nnc nni nnk nnl nnn