b-u bbb bbc bbe bbf bbt bbu bcb bcc bce bcf bct bcu be- beb bec bee bef bet beu bfb bfc bfe bff bft bfu btb btc bte btf btt btu bub buc bue buf but buu c-- cbb cbc cbe cbf cbt cbu ccb ccc cce ccf cct ccu ce- ceb cec cee cef cet ceu cfb cfc cfe cff cft cfu ctb ctc cte ctf ctt ctu cub cuc cue cuf cut cuu ebb ebc ebe ebf ebt ebu ec- ecb ecc ece ecf ect ecu eeb eec eee eef eet ef- efb efc efe eff eft etb etc ete etf ett etu eu- eub euc eue euf eut fbb fbc fbe fbf fbt fbu fcb fcc fce fcf fct fcu feb fec fee fef fet feu ffc ffe fff fft ffu ftb ftc fte ftf ftt ftu fub fue fuf fut fuu tbb tbc tbe tbf tbt tbu tcb tcc tce tcf tct tcu te- teb tec tee tef tet teu tfb tfc tfe tff tft tfu ttb ttc tte ttf ttt ttu tub tuc tue tuf tut tuu ubb ubc ube ubf ubt ubu ucb ucc uce ucf uct ucu ueb uec uee uef uet ufc ufe uff uft ufu utb utc ute utf utt utu uuc uue uut uuu