bbb bbc bbe bbg bbl bcb bcc bce bcg bcl be- beb bec bee beg bel bgb bgc bge bgg bgl blb blc ble blg bll c-- cbb cbc cbe cbg cbl ccb ccc cce ccg ccl ce- ceb cec cee ceg cel cgb cgc cge cgg cgl cl- clb clc cle clg cll ebb ebc ebe ebg ebl ec- ecb ecc ece ecg ecl eeb eec eee eeg eel egb egc ege egg egl elb elc ele elg ell gbc gbe gbg gbl gcb gcc gce gcg gcl ge- geb gec gee geg gel ggb ggc ggg glb glc gle glg gll lbb lbc lbe lbg lbl lcb lcc lce lcg lcl leb lec lee leg lel lgb lgc lge lgg lgl llb llc lle llg lll