b-u bbb bbi bbn bbs bbu bi- bib bii bin bis biu bnb bni bnn bns bnu bsb bsi bsn bss bsu bub bui bun bus buu ibb ibi ibn ibs ibu iib iii iin iis iiu in- inb ini inn ins inu is- isb isi isn iss isu iu- iub iui ius n-i nbb nbi nbn nbs nbu nib nii nin nis niu nnb nni nnn nns nnu nsb nsi nsn nss nsu nub nui nun nus nuu sbb sbi sbn sbs sbu sib sii sin sis siu snb sni snn sns snu ss- ssb ssi ssn sss ssu sub sui sun sus suu ubb ubi ubn ubs ubu uib uii uin uis uiu un- unb uni unn uns unu usb usi usn uss usu uun uus uuu