b-u bbb bbf bbi bbm bbn bbr bbs bbu bfb bff bfi bfm bfn bfr bfs bfu bi- bib bif bii bim bin bir bis biu bmb bmf bmi bmm bmn bmr bms bmu bnb bnf bni bnn bnr bns bnu brb brf bri brm brn brr brs bru bsb bsf bsi bsm bsn bsr bss bsu bub buf bui bum bun bur bus buu fbb fbf fbi fbm fbn fbr fbs fbu fff ffi ffm ffn ffr ffs ffu fib fif fii fim fin fir fis fiu fmb fmf fmi fmm fmn fmr fms fmu fnb fnf fni fnm fnn fnr fns fnu frb frf fri frm frn frr frs fru fsb fsf fsi fsm fsn fsr fss fsu fub fuf fui fum fun fur fus fuu i-f ibb ibf ibi ibm ibn ibr ibs ibu ifb iff ifi ifm ifn ifr ifs ifu iib iif iii iim iin iir iis iiu im- imb imf imi imm imn ims imu in- inb inf ini inm inn inr ins inu ir- irb irf iri irm irn irr irs iru is- isb isf isi ism isn isr iss isu iu- iub iui ium iur ius m-f m-r mbb mbf mbi mbm mbr mbs mbu mfb mff mfi mfm mfn mfr mfs mfu mi- mib mif mii mim min mir mis miu mmb mmf mmi mmm mmn mmr mms mmu mnb mnf mni mnm mnn mnr mns mnu mrb mrf mri mrm mrn mrr mrs mru msb msf msi msm msn msr mss msu mub muf mui mum mun mur mus muu n-i nbb nbf nbi nbm nbn nbr nbs nbu nfb nff nfi nfn nfr nfs nfu nib nif nii nim nin nir nis niu nmb nmi nmm nmn nmr nms nmu nnb nnf nni nnm nnn nns nnu nrb nrf nri nrm nrn nrr nrs nru nsb nsf nsi nsm nsn nsr nss nsu nub nui num nun nur nus nuu rbb rbf rbi rbm rbn rbr rbs rbu rfb rff rfi rfm rfn rfr rfs rfu rib rif rii rim rin rir ris rmb rmf rmi rmm rmn rmr rms rnb rni rnm rnn rnr rns rnu rrb rrf rri rrm rrn rrr rrs rru rsb rsf rsi rsm rsn rsr rss rsu rub ruf rui rum run rur rus ruu sbb sbf sbi sbm sbn sbr sbs sbu sfb sff sfi sfm sfn sfr sfs sfu sib sif sii sim sin sir sis siu smb smf smi smm smn smr sms smu snb snf sni snm snn snr sns snu sr- srb srf sri srm srn srr srs ss- ssb ssf ssi ssm ssn ssr sss ssu sub suf sui sum sun sur sus suu ubb ubf ubi ubn ubr ubs ubu uff ufi ufm ufn ufr ufs ufu uib uif uii uim uin uir uis uiu um- umb umf umi umm umn umr ums umu un- unb unf uni unm unn unr uns unu ur- urb urf uri urm urn urr urs uru usb usf usi usm usn usr uss usu uum uun uur uus uuu