b-u bbb bbc bbe bbf bbs bbt bbu bcb bcc bce bcf bcs bct bcu be- beb bec bee bef bes bet beu bfb bfc bfe bff bfs bft bfu bsb bsc bse bsf bss bst bsu btb btc bte btf bts btt btu bub buc bue buf bus but buu c-- cbb cbc cbe cbf cbs cbt cbu ccb ccc cce ccf ccs cct ccu ce- ceb cec cee cef ces cet ceu cfb cfc cfe cff cfs cft cfu csb csc cse csf css cst csu ctb ctc cte ctf cts ctt ctu cub cuc cue cuf cus cut cuu ebb ebc ebe ebf ebs ebt ebu ec- ecb ecc ece ecf ecs ect ecu eeb eec eee eef ees eet ef- efb efc efe eff efs eft es- esb esc ese esf ess est esu etb etc ete etf ets ett etu eu- eub euc eue euf eus eut fbb fbc fbe fbf fbs fbt fbu fcb fcc fce fcf fcs fct fcu feb fec fee fef fes fet feu ffc ffe fff ffs fft ffu fsb fsc fse fsf fss fst fsu ftb ftc fte ftf fts ftt ftu fub fue fuf fus fut fuu sbb sbc sbe sbf sbs sbt sbu scb scc sce scf scs sct scu se- seb sec see sef ses set seu sfb sfc sfe sff sfs sft sfu ss- ssb ssc sse ssf sss sst ssu stb stc ste stf sts stt stu sub suc sue suf sus sut suu tbb tbc tbe tbf tbs tbt tbu tcb tcc tce tcf tcs tct tcu te- teb tec tee tef tes tet teu tfb tfc tfe tff tfs tft tfu tsb tsc tse tsf tss tst tsu ttb ttc tte ttf tts ttt ttu tub tuc tue tuf tus tut tuu ubb ubc ube ubf ubs ubt ubu ucb ucc uce ucf ucs uct ucu ueb uec uee uef ues uet ufc ufe uff ufs uft ufu usb usc use usf uss ust usu utb utc ute utf uts utt utu uuc uue uus uut uuu