-ol bbb bbe bbi bbk bbl bbo bbt bbx be- beb bee bei bek bel beo bet bex bi- bib bie bii bik bil bio bit bix bkb bke bkk bkl bko bkt bkx blb ble bli blk bll blo blt blx bob boe boi bok bol boo bot box btb bte bti btk btl bto btt btx bxb bxi bxl bxo bxx ebb ebe ebi ebk ebl ebo ebt ebx eeb eee eek eel eeo eet eex eib eie eii eik eil eio eit eix ekb eke eki ekl eko ekt elb ele eli elk ell elo elt elx eo- eob eoe eoi eok eol eoo eot etb ete eti etk etl eto ett etx ex- exe exi exl exo ext exx ibb ibe ibi ibk ibl ibo ibt ibx ie- iee iei iek iel iet iex iib iie iii iil iio iit iix ikb ike iki ikk ikl iko ikt ikx il- ilb ile ili ilk ill ilo ilt ilx io- iob ioe ioi iol ioo iot itb ite iti itk itl ito itt itx ixe ixi ixl k-t kbb kbe kbi kbk kbl kbo kbx ke- keb kee kei kek kel keo ket kex kib kie kii kik kil kio kit kix kkb kke kki kkk kkl kkt kl- klb kli klo klt klx kob koe koi kok kol koo kot ktb kte ktk ktl kto ktt kxl kxo lbb lbe lbi lbk lbl lbo lbt lbx leb lee lei lek lel leo let lex lib lie lii lik lil lio lit lix lkb lkl lkt llb lle lli llk lll llo llt lob loe loi lok lol loo lot lox ltb lte lti ltk ltl lto ltt ltx lxi lxo lxx o-i ob- obb obe obi obk obl obo obt obx oeb oee oei oel oeo oet oex oib oie oii oik oil oio oit okb oke oki okk okl oko olb ole oli olk oll olo olt oo- oob ooi ook ool ooo oot oox ot- otb ote oti otk otl oto ott ox- oxb oxi oxo oxt oxx t-x tbb tbe tbi tbk tbl tbo tbt te- teb tee tei tek tel teo tet tex tib tie tii tik til tio tit tix tkb tke tkk tkl tko tkt tle tli tlk tll tlo tlt tlx to- tob toe toi tok tol too tot tox ttb tte tti ttk ttl tto ttt ttx txe txi txk txl txt xbe xbl xbx xee xel xet xex xie xii xio xit xix xkb xke xkl xlb xli xlt xoi xok xoo xot xox xti xtx xxi xxl xxo xxx