-ic b-u bbb bbc bbi bbr bbu bcb bcc bci bcr bcu bi- bib bic bii bir biu brb bri brr bru bub buc bui bur buu c-- cbb cbc cbi cbr cbu ccb ccc cci ccr ccu ci- cib cic cii cir ciu crb crc cri crr cru cub cuc cui cur cuu ibb ibc ibi ibr ibu icb icc ici icr icu iib iic iii iir iiu ir- irb irc iri irr iru iu- iub iuc iui iur rbb rbc rbi rbr rbu rcb rcc rci rcr rcu rib ric rii rir rrb rrc rri rrr rru rub ruc rui rur ruu ubb ubc ubi ubr ubu ucb ucc uci ucr ucu uib uic uii uir uiu ur- urb urc uri urr uru uuc uur uuu