bbb bbf bbi bbl bbr bbt bbx bfb bff bfi bfl bfr bft bfx bi- bib bif bii bil bir bit bix blb blf bli bll blr blt blx brb brf bri brl brr brt brx btb btf bti btl btr btt btx bxb bxi bxl bxx fbb fbf fbi fbl fbr fbt fbx fff ffi ffl ffr fft ffx fib fif fii fil fir fit fix flb flf fli fll flr flt flx frb frf fri frl frr frt ftb ftf fti ftl ftr ftt ftx fxi fxr fxt fxx i-f ibb ibf ibi ibl ibr ibt ibx ifb iff ifi ifl ifr ift ifx iib iif iii iil iir iit iix il- ilb ilf ili ill ilr ilt ilx ir- irb irf iri irl irr irt irx itb itf iti itl itt itx ixi ixl lbb lbf lbi lbl lbr lbt lbx lfb lff lfi lfl lfr lft lfx lib lif lii lil lir lit lix llb llf lli lll llr llt lrb lrf lri lrr lrt ltb ltf lti ltl ltr ltt ltx lxi lxr lxx rbb rbf rbi rbl rbr rbt rbx rfb rff rfi rfl rfr rft rib rif rii ril rir rit rix rlf rli rll rlr rlt rrb rrf rri rrl rrr rrt rtb rtf rti rtl rtr rtt rtx rxr t-x tbb tbf tbi tbl tbr tbt tfb tff tfi tfl tfr tft tfx tib tif tii til tir tit tix tlf tli tll tlr tlt tlx trb trf tri trl trr trt trx ttb ttf tti ttl ttr ttt ttx txf txi txl txt xbl xbr xbx xfl xft xfx xii xit xix xlb xlf xli xlr xlt xrf xrt xrx xtf xti xtr xtx xxi xxl xxx