bbb bbi bbn bbo bbr bbs bbt bi- bib bii bin bio bir bis bit bnb bni bnn bno bnr bns bnt bob boi bon boo bor bos bot brb bri brn bro brr brs brt bsb bsi bsn bso bsr bss bst btb bti btn bto btr bts btt ibb ibi ibn ibo ibr ibs ibt iib iii iin iio iir iis iit in- inb ini inn ino inr ins int io- iob ioi ion ioo ior ios iot ir- irb iri irn iro irr irs irt is- isb isi isn iso isr iss ist itb iti itn ito its itt n-i nbb nbi nbn nbo nbr nbs nbt nib nii nin nio nir nis nit nnb nni nnn nno nns nnt no- nob noi non noo nor nos not nrb nri nrn nro nrr nrs nrt nsb nsi nsn nso nsr nss nst ntb nti ntn nto ntr nts ntt o-i ob- obb obi obn obo obr obs obt oib oii oin oio oir ois oit on- onb oni onn ono onr ons ont oo- oob ooi oon ooo oor oos oot or- orb ori orn oro orr ors ort os- osb osi osn oso osr oss ost ot- otb oti otn oto otr ots ott rbb rbi rbn rbo rbr rbs rbt rib rii rin rio rir ris rit rnb rni rnn rno rnr rns rnt rob roi ron roo ror ros rot rrb rri rrn rrr rrs rrt rsb rsi rsn rso rsr rss rst rtb rti rtn rto rtr rts rtt sbb sbi sbn sbo sbr sbs sbt sib sii sin sio sir sis sit snb sni snn sno snr sns snt sob soi son soo sor sos sot sr- srb sri srn sro srr srs srt ss- ssb ssi ssn sso ssr sss sst stb sti stn sto str sts stt tbb tbi tbn tbo tbr tbs tbt tib tii tin tio tir tis tit tnb tni tnn tno tnr tns tnt to- tob toi ton too tor tos tot trb tri trn tro trr trs trt tsb tsi tsn tso tsr tss tst ttb tti ttn tto ttr tts ttt