-er b-u bbb bbd bbe bbo bbr bbt bbu bbx bdb bdd bde bdo bdr bdt bdu bdv bdx be- beb bed bee beo ber bet beu bev bex bob bod boe boo bor bot bou bov box brb brd bre bro brr brt bru brv brx btb btd bte bto btr btt btu btv btx bub bud bue buo bur but buu bux bvb bvd bve bvo bvr bvt bvu bvv bxb bxd bxo bxx dbb dbd dbe dbo dbr dbt dbu dbv dbx ddb ddd dde ddo ddr ddt ddu ddx de- deb ded dee deo der det deu dev dex dob dod doe doo dor dot dou dov dox drb drd dre dro drr drt dru drv drx dtb dtd dte dto dtr dtt dtu dtv dtx dub dud due duo dur dut duv dux dvb dvd dve dvr dvt dvu dvx dxd dxo dxr dxt dxx ebb ebd ebe ebo ebr ebt ebu ebv ebx ed- edb edd ede edo edr edt edu edx eeb eed eee eeo eer eet eev eex eo- eob eod eoe eoo eor eot eou erb erd ere ero err ert eru erv etb etd ete eto etr ett etu etv etx eu- eub eud eue eur eut euv eux evb evd eve evo evr evt evv ex- exd exe exo exr ext exu exx ob- obb obd obe obo obr obt obu obv obx odb odd ode odo odr odt odu odv oeb oed oee oeo oer oet oex oo- oob ood ooo oor oot oov oox or- orb ord ore oro orr ort oru orv orx ot- otb otd ote oto otr ott otu otv ou- oud oue ouo our out ov- ovb ovd ove ovo ovv ox- oxb oxo oxt oxx rbb rbd rbe rbo rbr rbt rbu rbx rdb rdd rde rdo rdr rdt rdu rdv rdx re- reb red ree reo rer ret reu rev rex rob rod roe roo ror rot rou rov rox rrb rrd rrr rrt rru rtb rtd rte rto rtr rtt rtu rtv rtx rub rud rue ruo rur rut ruu ruv rux rvb rvd rve rvo rvr rvt rvu rvv rxr t-x tbb tbd tbe tbo tbr tbt tbu tbv tdb tdd tde tdo tdr tdt tdu tdv tdx te- teb ted tee teo ter tet teu tev tex to- tob tod toe too tor tot tou tov tox trb trd tre tro trr trt tru trv trx ttb ttd tte tto ttr ttt ttu ttv ttx tub tud tue tuo tur tut tuu tuv tux tvb tvd tve tvo tvr tvt tvu tvx txe txt txu ubb ube ubo ubr ubt ubu ubv ubx udb udd ude udo udr udt udu udv udx ueb ued uee uer uet uob uod uoe uoo uor uot uox ur- urb urd ure uro urr urt uru urx utb utd ute uto utr utt utu utv utx uue uur uut uuu uvb uve uvo uvu uvv uxb uxo uxr uxt uxu v-e vbd vbo vbr vbv vdb vdd vde vdo vdr vdt vdu vdv vdx veb ved vee veo ver vet veu vex vob vod voe voo vor vot vou vov vox vrb vrd vre vrr vrt vru vtb vte vto vtr vtt vtu vtv vtx vue vur vut vuv vvb vvo vvr vvt vvv vxd vxr vxv xbe xbr xbx xdb xde xdr xdt xdv xed xee xer xet xeu xev xex xod xoo xor xot xov xox xrd xrt xrx xtr xtv xtx xue xuv xvt xxo xxv xxx