bbb bbi bbn bbo bbr bbs bbt bbx bi- bib bii bin bio bir bis bit bix bnb bni bnn bno bnr bns bnt bnx bob boi bon boo bor bos bot box brb bri brn bro brr brs brt brx bsb bsi bsn bso bsr bss bst bsx btb bti btn bto btr bts btt btx bxb bxi bxn bxo bxx ibb ibi ibn ibo ibr ibs ibt ibx iib iii iin iio iir iis iit iix in- inb ini inn ino inr ins int inx io- iob ioi ion ioo ior ios iot ir- irb iri irn iro irr irs irt irx is- isb isi isn iso isr iss ist itb iti itn ito its itt itx ixi ixn n-i nbb nbi nbn nbo nbr nbs nbt nbx nib nii nin nio nir nis nit nix nnb nni nnn nno nns nnt no- nob noi non noo nor nos not nox nrb nri nrn nro nrr nrs nrt nrx nsb nsi nsn nso nsr nss nst nsx ntb nti ntn nto ntr nts ntt ntx nxt o-i ob- obb obi obn obo obr obs obt obx oib oii oin oio oir ois oit on- onb oni onn ono onr ons ont onx oo- oob ooi oon ooo oor oos oot oox or- orb ori orn oro orr ors ort orx os- osb osi osn oso osr oss ost osx ot- otb oti otn oto otr ots ott ox- oxb oxi oxn oxo oxt oxx rbb rbi rbn rbo rbr rbs rbt rbx rib rii rin rio rir ris rit rix rnb rni rnn rno rnr rns rnt rob roi ron roo ror ros rot rox rrb rri rrn rrr rrs rrt rsb rsi rsn rso rsr rss rst rsx rtb rti rtn rto rtr rts rtt rtx rxr rxs sbb sbi sbn sbo sbr sbs sbt sbx sib sii sin sio sir sis sit six snb sni snn sno snr sns snt sob soi son soo sor sos sot sox sr- srb sri srn sro srr srs srt srx ss- ssb ssi ssn sso ssr sss sst ssx stb sti stn sto str sts stt stx sxi sxn sxs sxt t-x tbb tbi tbn tbo tbr tbs tbt tib tii tin tio tir tis tit tix tnb tni tnn tno tnr tns tnt tnx to- tob toi ton too tor tos tot tox trb tri trn tro trr trs trt trx tsb tsi tsn tso tsr tss tst tsx ttb tti ttn tto ttr tts ttt ttx txi txn txs txt xbr xbx xii xin xio xis xit xix xno xns xoi xon xoo xor xos xot xox xrt xrx xsb xsi xss xst xti xtr xts xtx xxi xxo xxx