b-u bbb bbi bbn bbo bbr bbs bbu bi- bib bii bin bio bir bis biu bnb bni bnn bno bnr bns bnu bob boi bon boo bor bos bou brb bri brn bro brr brs bru bsb bsi bsn bso bsr bss bsu bub bui bun buo bur bus buu ibb ibi ibn ibo ibr ibs ibu iib iii iin iio iir iis iiu in- inb ini inn ino inr ins inu io- iob ioi ion ioo ior ios iou ir- irb iri irn iro irr irs iru is- isb isi isn iso isr iss isu iu- iub iui iur ius n-i nbb nbi nbn nbo nbr nbs nbu nib nii nin nio nir nis niu nnb nni nnn nno nns nnu no- nob noi non noo nor nos nou nrb nri nrn nro nrr nrs nru nsb nsi nsn nso nsr nss nsu nub nui nun nuo nur nus nuu o-i ob- obb obi obn obo obr obs obu oib oii oin oio oir ois oiu on- onb oni onn ono onr ons onu oo- oob ooi oon ooo oor oos or- orb ori orn oro orr ors oru os- osb osi osn oso osr oss osu ou- oui oun ouo our ous rbb rbi rbn rbo rbr rbs rbu rib rii rin rio rir ris rnb rni rnn rno rnr rns rnu rob roi ron roo ror ros rou rrb rri rrn rrr rrs rru rsb rsi rsn rso rsr rss rsu rub rui run ruo rur rus ruu sbb sbi sbn sbo sbr sbs sbu sib sii sin sio sir sis siu snb sni snn sno snr sns snu sob soi son soo sor sos sou sr- srb sri srn sro srr srs ss- ssb ssi ssn sso ssr sss ssu sub sui sun suo sur sus suu ubb ubi ubn ubo ubr ubs ubu uib uii uin uio uir uis uiu un- unb uni unn uno unr uns unu uob uon uoo uor uos ur- urb uri urn uro urr urs uru usb usi usn uso usr uss usu uun uur uus uuu