-er bbb bbe bbf bbi bbl bbr bbx be- beb bee bef bei bel ber bev bex bfb bfe bff bfi bfl bfr bfv bfx bi- bib bie bif bii bil bir biv bix blb ble blf bli bll blr blv blx brb bre brf bri brl brr brv brx bvb bve bvi bvl bvr bvv bxb bxi bxl bxx ebb ebe ebf ebi ebl ebr ebv ebx eeb eee eef eel eer eev eex ef- efb efe eff efi efl efr efx eib eie eif eii eil eir eiv eix elb ele elf eli ell elr elv elx erb ere erf eri erl err erv evb eve evf evi evl evr evv ex- exe exi exl exr exx fbb fbe fbf fbi fbl fbr fbx feb fee fef fei fel fer fev fex ffe fff ffi ffl ffr ffv ffx fib fie fif fii fil fir fix flb fle flf fli fll flr flx frb fre frf fri frl frr fxe fxi fxr fxx i-f i-v ibb ibe ibf ibi ibl ibr ibv ibx ie- iee ief iei iel ier iev iex ifb ife iff ifi ifl ifr ifx iib iie iif iii iil iir iix il- ilb ile ilf ili ill ilr ilv ilx ir- irb ire irf iri irl irr irv irx ivb ive ivf ivi ivl ivr ivv ivx ixe ixi ixl lbb lbe lbf lbi lbl lbr lbv lbx leb lee lef lei lel ler lev lex lfb lfe lff lfi lfl lfr lfx lib lie lif lii lil lir liv lix llb lle llf lli lll llr llv lrb lrf lri lrr lrv lvb lve lvf lvi lvl lvr lvv lvx lxi lxr lxv lxx rbb rbe rbf rbi rbl rbr rbx re- reb ree ref rei rel rer rev rex rfb rfe rff rfi rfl rfr rfv rib rie rif rii ril rir riv rix rle rlf rli rll rlr rrb rrf rri rrl rrr rvb rve rvf rvi rvl rvr rvv rxr v-e vbi vbl vbr vbv veb vee vef vei vel ver vex vfb vff vfi vfl vfr vfv vi- vib vie vif vii vil vir viv vix vl- vlb vle vlf vll vlv vrb vre vrf vri vrr vvb vvi vvr vvv vxl vxr vxv xbe xbl xbr xbx xee xel xer xev xex xfe xfl xfv xfx xie xii xiv xix xlb xlf xli xlr xlv xrf xrx xvi xvl xxi xxl xxv xxx