-ic b-u bbb bbc bbi bbn bbr bbt bbu bcb bcc bci bcn bcr bct bcu bi- bib bic bii bin bir bit biu bnb bnc bni bnn bnr bnt bnu brb bri brn brr brt bru btb btc bti btn btr btt btu bub buc bui bun bur but buu c-- cbb cbc cbi cbn cbr cbt cbu ccb ccc cci ccn ccr cct ccu ci- cib cic cii cin cir cit ciu cn- cnb cnc cni cnn cnr cnt cnu crb crc cri crn crr crt cru ctb ctc cti ctn ctr ctt ctu cub cuc cui cun cur cut cuu ibb ibc ibi ibn ibr ibt ibu icb icc ici icn icr ict icu iib iic iii iin iir iit iiu in- inb inc ini inn inr int inu ir- irb irc iri irn irr irt iru itb itc iti itn itt itu iu- iub iuc iui iur iut n-i nbb nbc nbi nbn nbr nbt nbu ncb ncc nci ncn ncr nct ncu nib nic nii nin nir nit niu nnb nnc nni nnn nnt nnu nrb nrc nri nrn nrr nrt nru ntb ntc nti ntn ntr ntt ntu nub nuc nui nun nur nut nuu rbb rbc rbi rbn rbr rbt rbu rcb rcc rci rcn rcr rct rcu rib ric rii rin rir rit rnb rnc rni rnn rnr rnt rnu rrb rrc rri rrn rrr rrt rru rtb rtc rti rtn rtr rtt rtu rub ruc rui run rur rut ruu tbb tbc tbi tbn tbr tbt tbu tcb tcc tci tcn tcr tct tcu tib tic tii tin tir tit tiu tnb tnc tni tnn tnr tnt trb trc tri trn trr trt tru ttb ttc tti ttn ttr ttt ttu tub tuc tui tun tur tut tuu ubb ubc ubi ubn ubr ubt ubu ucb ucc uci ucn ucr uct ucu uib uic uii uin uir uit uiu un- unb unc uni unn unr unt unu ur- urb urc uri urn urr urt uru utb utc uti utn utr utt utu uuc uun uur uut uuu