-ic b-u bbb bbc bbi bbr bbs bbu bcb bcc bci bcr bcs bcu bi- bib bic bii bir bis biu brb bri brr brs bru bsb bsc bsi bsr bss bsu bub buc bui bur bus buu c-- cbb cbc cbi cbr cbs cbu ccb ccc cci ccr ccs ccu ci- cib cic cii cir cis ciu crb crc cri crr crs cru csb csc csi csr css csu cub cuc cui cur cus cuu ibb ibc ibi ibr ibs ibu icb icc ici icr ics icu iib iic iii iir iis iiu ir- irb irc iri irr irs iru is- isb isc isi isr iss isu iu- iub iuc iui iur ius rbb rbc rbi rbr rbs rbu rcb rcc rci rcr rcs rcu rib ric rii rir ris rrb rrc rri rrr rrs rru rsb rsc rsi rsr rss rsu rub ruc rui rur rus ruu sbb sbc sbi sbr sbs sbu scb scc sci scr scs scu sib sic sii sir sis siu sr- srb src sri srr srs ss- ssb ssc ssi ssr sss ssu sub suc sui sur sus suu ubb ubc ubi ubr ubs ubu ucb ucc uci ucr ucs ucu uib uic uii uir uis uiu ur- urb urc uri urr urs uru usb usc usi usr uss usu uuc uur uus uuu