b-u bbb bbd bbe bbk bbo bbu bbx bdb bdd bde bdk bdo bdu bdx be- beb bed bee bek beo beu bex bkb bke bkk bko bkx bob bod boe bok boo bou box bub bud bue buk buo buu bux bxb bxd bxo bxx dbb dbd dbe dbk dbo dbu dbx ddb ddd dde ddk ddo ddu ddx de- deb ded dee dek deo deu dex dkb dke dkk dko dku dkx dob dod doe dok doo dou dox dub dud due duk duo dux dxd dxo dxx ebb ebd ebe ebk ebo ebu ebx ed- edb edd ede edk edo edu edx eeb eed eee eek eeo eex ekb ekd eke eko eku eo- eob eod eoe eok eoo eou eu- eub eud eue eux ex- exd exe exo exu exx kbb kbd kbe kbk kbo kbu kbx kdb kde kdk kdo kdu kdx ke- keb ked kee kek keo kex kkb kke kkk kku kob kod koe kok koo kou kub kud kue kuk kuu kxo ob- obb obd obe obk obo obu obx odb odd ode odo odu oeb oed oee oeo oex okb okd oke okk oko oku oo- oob ood ook ooo oox ou- oud oue ouk ouo ox- oxb oxo oxx ubb ube ubk ubo ubu ubx udb udd ude udk udo udu udx ueb ued uee ukb uke ukk uku uob uod uoe uok uoo uox uue uuu uxb uxo uxu xbe xbx xdb xde xdk xed xee xeu xex xkb xke xod xok xoo xox xue xxo xxx