-ic bbb bbc bbi bbn bbt bcb bcc bci bcn bct bi- bib bic bii bin bit bnb bnc bni bnn bnt btb btc bti btn btt c-- cbb cbc cbi cbn cbt ccb ccc cci ccn cct ci- cib cic cii cin cit cn- cnb cnc cni cnn cnt ctb ctc cti ctn ctt ibb ibc ibi ibn ibt icb icc ici icn ict iib iic iii iin iit in- inb inc ini inn int itb itc iti itn itt n-i nbb nbc nbi nbn nbt ncb ncc nci ncn nct nib nic nii nin nit nnb nnc nni nnn nnt ntb ntc nti ntn ntt tbb tbc tbi tbn tbt tcb tcc tci tcn tct tib tic tii tin tit tnb tnc tni tnn tnt ttb ttc tti ttn ttt