b-u bbb bbc bbe bbt bbu bcb bcc bce bct bcu be- beb bec bee bet beu btb btc bte btt btu bub buc bue but buu c-- cbb cbc cbe cbt cbu ccb ccc cce cct ccu ce- ceb cec cee cet ceu ctb ctc cte ctt ctu cub cuc cue cut cuu ebb ebc ebe ebt ebu ec- ecb ecc ece ect ecu eeb eec eee eet etb etc ete ett etu eu- eub euc eue eut tbb tbc tbe tbt tbu tcb tcc tce tct tcu te- teb tec tee tet teu ttb ttc tte ttt ttu tub tuc tue tut tuu ubb ubc ube ubt ubu ucb ucc uce uct ucu ueb uec uee uet utb utc ute utt utu uuc uue uut uuu