b-u bbb bbi bbn bbq bbr bbs bbt bbu bi- bib bii bin bir bis bit biu bnb bni bnn bnr bns bnt bnu bqt brb bri brn brq brr brs brt bru bsb bsi bsn bsr bss bst bsu btb bti btn btq btr bts btt btu bub bui bun bur bus but buu ibb ibi ibn ibr ibs ibt ibu iib iii iin iir iis iit iiu in- inb ini inn inq inr ins int inu iqs iqt iqu ir- irb iri irn irq irr irs irt iru is- isb isi isn isq isr iss ist isu itb iti itn itq its itt itu iu- iub iui iur ius iut n-i nbb nbi nbn nbr nbs nbt nbu nib nii nin niq nir nis nit niu nnb nni nnn nns nnt nnu nqs nqt nrb nri nrn nrr nrs nrt nru nsb nsi nsn nsr nss nst nsu ntb nti ntn ntq ntr nts ntt ntu nub nui nun nuq nur nus nut nuu qbq qbs qin qir qis qit qiu qnb qni qns qqq qqu qrb qri qrs qrt qru qsi qsr qst qti qtq qtr qts qu- qui qur qus qut rbb rbi rbn rbr rbs rbt rbu rib rii rin riq rir ris rit rnb rni rnn rnr rns rnt rnu rqn rqs rrb rri rrn rrq rrr rrs rrt rru rsb rsi rsn rsq rsr rss rst rsu rtb rti rtn rtq rtr rts rtt rtu rub rui run rur rus rut ruu sbb sbi sbn sbq sbr sbs sbt sbu sib sii sin siq sir sis sit siu snb sni snn snr sns snt snu sqi sqn sqq sqr sqs sr- srb sri srn srq srr srs srt ss- ssb ssi ssn ssq ssr sss sst ssu stb sti stn stq str sts stt stu sub sui sun suq sur sus sut suu tbb tbi tbn tbr tbs tbt tbu tib tii tin tir tis tit tiu tnb tni tnn tnq tnr tns tnt trb tri trn trq trr trs trt tru tsb tsi tsn tsq tsr tss tst tsu ttb tti ttn ttr tts ttt ttu tub tui tun tur tus tut tuu ubb ubi ubn ubr ubs ubt ubu uib uii uin uiq uir uis uit uiu un- unb uni unn unq unr uns unt unu ur- urb uri urn urr urs urt uru usb usi usn usr uss ust usu utb uti utn utr uts utt utu uun uur uus uut uuu