b-u bbb bbi bbn bbo bbs bbu bi- bib bii bin bio bis biu bnb bni bnn bno bns bnu bob boi bon boo bos bou bsb bsi bsn bso bss bsu bub bui bun buo bus buu ibb ibi ibn ibo ibs ibu iib iii iin iio iis iiu in- inb ini inn ino ins inu io- iob ioi ion ioo ios iou is- isb isi isn iso iss isu iu- iub iui ius n-i nbb nbi nbn nbo nbs nbu nib nii nin nio nis niu nnb nni nnn nno nns nnu no- nob noi non noo nos nou nsb nsi nsn nso nss nsu nub nui nun nuo nus nuu o-i ob- obb obi obn obo obs obu oib oii oin oio ois oiu on- onb oni onn ono ons onu oo- oob ooi oon ooo oos os- osb osi osn oso oss osu ou- oui oun ouo ous sbb sbi sbn sbo sbs sbu sib sii sin sio sis siu snb sni snn sno sns snu sob soi son soo sos sou ss- ssb ssi ssn sso sss ssu sub sui sun suo sus suu ubb ubi ubn ubo ubs ubu uib uii uin uio uis uiu un- unb uni unn uno uns unu uob uon uoo uos usb usi usn uso uss usu uun uus uuu