bbb bbi bbk bbn bbo bbr bbs bbt bi- bib bii bik bin bio bir bis bit bkb bkk bkn bko bkr bks bkt bnb bni bnk bnn bno bnr bns bnt bob boi bok bon boo bor bos bot brb bri brk brn bro brr brs brt bsb bsi bsk bsn bso bsr bss bst btb bti btk btn bto btr bts btt ibb ibi ibk ibn ibo ibr ibs ibt iib iii iin iio iir iis iit ikb iki ikk iko ikr iks ikt in- inb ini ink inn ino inr ins int io- iob ioi ion ioo ior ios iot ir- irb iri irk irn iro irr irs irt is- isb isi isk isn iso isr iss ist itb iti itk itn ito its itt k-t kbb kbi kbk kbn kbo kbr kbs kib kii kik kin kio kir kis kit kkb kki kkk kkn kkr kks kkt kn- kni knk knn kno knr knt kob koi kok kon koo kor kos kot kri krk krn kro krr krs krt ksb ksi ksk ksn kso ksr kss kst ktb ktk ktn kto ktr kts ktt n-i nbb nbi nbk nbn nbo nbr nbs nbt nib nii nik nin nio nir nis nit nki nkk nkn nko nkr nks nkt nnb nni nnk nnn nno nns nnt no- nob noi nok non noo nor nos not nrb nri nrk nrn nro nrr nrs nrt nsb nsi nsk nsn nso nsr nss nst ntb nti ntk ntn nto ntr nts ntt o-i ob- obb obi obk obn obo obr obs obt oib oii oik oin oio oir ois oit okb oki okk oko okr oks on- onb oni onk onn ono onr ons ont oo- oob ooi ook oon ooo oor oos oot or- orb ori ork orn oro orr ors ort os- osb osi osk osn oso osr oss ost ot- otb oti otk otn oto otr ots ott rbb rbi rbk rbn rbo rbr rbs rbt rib rii rik rin rio rir ris rit rkb rkk rko rks rkt rnb rni rnn rno rnr rns rnt rob roi rok ron roo ror ros rot rrb rri rrk rrn rrr rrs rrt rsb rsi rsk rsn rso rsr rss rst rtb rti rtk rtn rto rtr rts rtt sbb sbi sbk sbn sbo sbr sbs sbt sib sii sik sin sio sir sis sit sk- skb ski skk sko skr sks skt snb sni snk snn sno snr sns snt sob soi sok son soo sor sos sot sr- srb sri srk srn sro srr srs srt ss- ssb ssi ssk ssn sso ssr sss sst stb sti stk stn sto str sts stt tbb tbi tbk tbn tbo tbr tbs tbt tib tii tik tin tio tir tis tit tkb tkk tko tkr tks tkt tnb tni tnk tnn tno tnr tns tnt to- tob toi tok ton too tor tos tot trb tri trk trn tro trr trs trt tsb tsi tsk tsn tso tsr tss tst ttb tti ttk ttn tto ttr tts ttt