b-u bbb bbi bbm bbn bbr bbs bbu bi- bib bii bim bin bir bis biu bmb bmi bmm bmn bmr bms bmu bnb bni bnn bnr bns bnu brb bri brm brn brr brs bru bsb bsi bsm bsn bsr bss bsu bub bui bum bun bur bus buu ibb ibi ibm ibn ibr ibs ibu iib iii iim iin iir iis iiu im- imb imi imm imn ims imu in- inb ini inm inn inr ins inu ir- irb iri irm irn irr irs iru is- isb isi ism isn isr iss isu iu- iub iui ium iur ius m-r mbb mbi mbm mbr mbs mbu mi- mib mii mim min mir mis miu mmb mmi mmm mmn mmr mms mmu mnb mni mnm mnn mnr mns mnu mrb mri mrm mrn mrr mrs mru msb msi msm msn msr mss msu mub mui mum mun mur mus muu n-i nbb nbi nbm nbn nbr nbs nbu nib nii nim nin nir nis niu nmb nmi nmm nmn nmr nms nmu nnb nni nnm nnn nns nnu nrb nri nrm nrn nrr nrs nru nsb nsi nsm nsn nsr nss nsu nub nui num nun nur nus nuu rbb rbi rbm rbn rbr rbs rbu rib rii rim rin rir ris rmb rmi rmm rmn rmr rms rnb rni rnm rnn rnr rns rnu rrb rri rrm rrn rrr rrs rru rsb rsi rsm rsn rsr rss rsu rub rui rum run rur rus ruu sbb sbi sbm sbn sbr sbs sbu sib sii sim sin sir sis siu smb smi smm smn smr sms smu snb sni snm snn snr sns snu sr- srb sri srm srn srr srs ss- ssb ssi ssm ssn ssr sss ssu sub sui sum sun sur sus suu ubb ubi ubn ubr ubs ubu uib uii uim uin uir uis uiu um- umb umi umm umn umr ums umu un- unb uni unm unn unr uns unu ur- urb uri urm urn urr urs uru usb usi usm usn usr uss usu uum uun uur uus uuu