b-u bbb bbc bbd bbe bbk bbu bcb bcc bcd bce bck bcu bdb bdc bdd bde bdk bdu be- beb bec bed bee bek beu bkb bkc bke bkk bub buc bud bue buk buu c-- cbb cbc cbd cbe cbk cbu ccb ccc ccd cce cck ccu cdb cdc cdd cde cdk cdu ce- ceb cec ced cee cek ceu ckb ckc ckd cub cuc cud cue cuk cuu dbb dbc dbd dbe dbk dbu dcb dcc dcd dce dck dcu ddb ddc ddd dde ddk ddu de- deb dec ded dee dek deu dkb dkc dke dkk dku dub duc dud due duk ebb ebc ebd ebe ebk ebu ec- ecb ecc ecd ece eck ecu ed- edb edc edd ede edk edu eeb eec eed eee eek ekb ekc ekd eke eku eu- eub euc eud eue kbb kbc kbd kbe kbk kbu kcb kcc kcd kce kck kcu kdb kdc kde kdk kdu ke- keb kec ked kee kek kkb kkc kke kkk kku kub kuc kud kue kuk kuu ubb ubc ube ubk ubu ucb ucc ucd uce uck ucu udb udc udd ude udk udu ueb uec ued uee ukb ukc uke ukk uku uuc uue uuu