-ic bbb bbc bbi bbm bbr bcb bcc bci bcm bcr bi- bib bic bii bim bir bmb bmc bmi bmm bmr brb bri brm brr c-- cbb cbc cbi cbm cbr ccb ccc cci ccm ccr ci- cib cic cii cim cir cmb cmc cmi cmm cmr crb crc cri crm crr ibb ibc ibi ibm ibr icb icc ici icm icr iib iic iii iim iir im- imb imc imi imm ir- irb irc iri irm irr m-r mbb mbc mbi mbm mbr mc- mcb mcc mci mcm mcr mi- mib mic mii mim mir mmb mmc mmi mmm mmr mrb mrc mri mrm mrr rbb rbc rbi rbm rbr rcb rcc rci rcm rcr rib ric rii rim rir rmb rmc rmi rmm rmr rrb rrc rri rrm rrr