b-u bbb bbi bbn bbo bbs bbt bbu bi- bib bii bin bio bis bit biu bnb bni bnn bno bns bnt bnu bob boi bon boo bos bot bou bsb bsi bsn bso bss bst bsu btb bti btn bto bts btt btu bub bui bun buo bus but buu ibb ibi ibn ibo ibs ibt ibu iib iii iin iio iis iit iiu in- inb ini inn ino ins int inu io- iob ioi ion ioo ios iot iou is- isb isi isn iso iss ist isu itb iti itn ito its itt itu iu- iub iui ius iut n-i nbb nbi nbn nbo nbs nbt nbu nib nii nin nio nis nit niu nnb nni nnn nno nns nnt nnu no- nob noi non noo nos not nou nsb nsi nsn nso nss nst nsu ntb nti ntn nto nts ntt ntu nub nui nun nuo nus nut nuu o-i ob- obb obi obn obo obs obt obu oib oii oin oio ois oit oiu on- onb oni onn ono ons ont onu oo- oob ooi oon ooo oos oot os- osb osi osn oso oss ost osu ot- otb oti otn oto ots ott otu ou- oui oun ouo ous out sbb sbi sbn sbo sbs sbt sbu sib sii sin sio sis sit siu snb sni snn sno sns snt snu sob soi son soo sos sot sou ss- ssb ssi ssn sso sss sst ssu stb sti stn sto sts stt stu sub sui sun suo sus sut suu tbb tbi tbn tbo tbs tbt tbu tib tii tin tio tis tit tiu tnb tni tnn tno tns tnt to- tob toi ton too tos tot tou tsb tsi tsn tso tss tst tsu ttb tti ttn tto tts ttt ttu tub tui tun tuo tus tut tuu ubb ubi ubn ubo ubs ubt ubu uib uii uin uio uis uit uiu un- unb uni unn uno uns unt unu uob uon uoo uos uot usb usi usn uso uss ust usu utb uti utn uto uts utt utu uun uus uut uuu