bbb bbc bbe bbg bbk bcb bcc bce bcg bck be- beb bec bee beg bek bgb bgc bge bgg bgk bkb bkc bke bkg bkk c-- cbb cbc cbe cbg cbk ccb ccc cce ccg cck ce- ceb cec cee ceg cek cgb cgc cge cgg ckb ckc ebb ebc ebe ebg ebk ec- ecb ecc ece ecg eck eeb eec eee eeg eek egb egc ege egg ekb ekc eke ekg gbc gbe gbg gbk gcb gcc gce gcg gck ge- geb gec gee geg gek ggb ggc ggg gkb kbb kbc kbe kbk kcb kcc kce kcg kck ke- keb kec kee keg kek kgb kgc kkb kkc kke kkk