-ic bbb bbc bbi bbn bbr bcb bcc bci bcn bcr bi- bib bic bii bin bir bnb bnc bni bnn bnr brb bri brn brr c-- cbb cbc cbi cbn cbr ccb ccc cci ccn ccr ci- cib cic cii cin cir cn- cnb cnc cni cnn cnr crb crc cri crn crr ibb ibc ibi ibn ibr icb icc ici icn icr iib iic iii iin iir in- inb inc ini inn inr ir- irb irc iri irn irr n-i nbb nbc nbi nbn nbr ncb ncc nci ncn ncr nib nic nii nin nir nnb nnc nni nnn nrb nrc nri nrn nrr rbb rbc rbi rbn rbr rcb rcc rci rcn rcr rib ric rii rin rir rnb rnc rni rnn rnr rrb rrc rri rrn rrr