b-u bbb bbe bbo bbq bbs bbu bbx be- beb bee beo beq bes beu bex bez bob boe boo boq bos bou box boz bqe bsb bse bso bss bsu bsx bub bue buo bus buu bux buz bxb bxo bxq bxx bze bzo bzs bzu bzz ebb ebe ebo ebq ebs ebu ebx eeb eee eeo ees eex eo- eob eoe eoo eoq eos eou eqe eqq eqs equ es- esb ese eso esq ess esu esx eu- eub eue eus eux ex- exe exo exs exu exx eze ezo ezs ezz ob- obb obe obo obs obu obx oeb oee oeo oes oex oo- oob ooo oos oox oqb oqo os- osb ose oso osq oss osu osx ou- oue ouo ous ox- oxb oxo oxx oze ozo ozs ozu ozz qbe qbq qbs qee qeo qex qoo qos qqq qqu qso qu- que quo qus qux qxe sbb sbe sbo sbq sbs sbu sbx se- seb see seo seq ses seu sex sez sob soe soo soq sos sou sox soz sqq sqs sqx ss- ssb sse sso ssq sss ssu ssx ssz sub sue suo suq sus suu sux suz sxs sxu sze szu ubb ube ubo ubs ubu ubx ueb uee ues uob uoe uoo uos uox usb use uso uss usu usx usz uue uus uuu uxb uxo uxu uzb uzo uzu xbe xbx xee xeq xes xeu xex xoo xos xox xsb xss xue xus xxo xxx zbb zbs zeb zee zeo zeq zes zez zo- zob zoe zoo zos zou zox zse zsu zsz zub zus zuz zxx zzs zzx zzz