b-u bbb bbc bbd bbe bbf bbk bbt bbu bcb bcc bcd bce bcf bck bct bcu bdb bdc bdd bde bdf bdk bdt bdu be- beb bec bed bee bef bek bet beu bfb bfc bfd bfe bff bft bfu bkb bkc bke bkf bkk bkt btb btc btd bte btf btk btt btu bub buc bud bue buf buk but buu c-- cbb cbc cbd cbe cbf cbk cbt cbu ccb ccc ccd cce ccf cck cct ccu cdb cdc cdd cde cdf cdk cdt cdu ce- ceb cec ced cee cef cek cet ceu cfb cfc cfd cfe cff cfk cft cfu ckb ckc ckd ckt ctb ctc ctd cte ctf ctk ctt ctu cub cuc cud cue cuf cuk cut cuu dbb dbc dbd dbe dbf dbk dbt dbu dcb dcc dcd dce dcf dck dct dcu ddb ddc ddd dde ddf ddk ddt ddu de- deb dec ded dee def dek det deu dfb dfc dfd dfe dff dfk dft dfu dkb dkc dke dkk dkt dku dtb dtc dtd dte dtf dtk dtt dtu dub duc dud due duf duk dut ebb ebc ebd ebe ebf ebk ebt ebu ec- ecb ecc ecd ece ecf eck ect ecu ed- edb edc edd ede edf edk edt edu eeb eec eed eee eef eek eet ef- efb efc efd efe eff eft ekb ekc ekd eke ekf ekt eku etb etc etd ete etf etk ett etu eu- eub euc eud eue euf eut fbb fbc fbd fbe fbf fbk fbt fbu fcb fcc fcd fce fcf fck fct fcu fdb fdc fdd fde fdf fdk fdt fdu feb fec fed fee fef fek fet feu ffc ffd ffe fff ffk fft ffu fkb fkc fkf fkk fkt ftb ftc ftd fte ftf ftk ftt ftu fub fud fue fuf fuk fut fuu k-t kbb kbc kbd kbe kbf kbk kbu kcb kcc kcd kce kck kct kcu kdb kdc kde kdf kdk kdt kdu ke- keb kec ked kee kef kek ket kfc kfd kff kfu kkb kkc kke kkk kkt kku ktb ktc kte ktf ktk ktt ktu kub kuc kud kue kuk kut kuu tbb tbc tbd tbe tbf tbk tbt tbu tcb tcc tcd tce tcf tck tct tcu tdb tdc tdd tde tdf tdk tdt tdu te- teb tec ted tee tef tek tet teu tfb tfc tfd tfe tff tfk tft tfu tkb tkc tke tkk tkt ttb ttc ttd tte ttf ttk ttt ttu tub tuc tud tue tuf tuk tut tuu ubb ubc ube ubf ubk ubt ubu ucb ucc ucd uce ucf uck uct ucu udb udc udd ude udf udk udt udu ueb uec ued uee uef uet ufc ufd ufe uff uft ufu ukb ukc uke ukf ukk uku utb utc utd ute utf utk utt utu uuc uue uut uuu