bbb bbc bbe bbh bbk bbl bcb bcc bce bch bck bcl be- beb bec bee beh bek bel bhb bhc bhe bhh bhk bhl bkb bkc bke bkk bkl blb blc ble blh blk bll c-- cbb cbc cbe cbh cbk cbl ccb ccc cce cch cck ccl ce- ceb cec cee ceh cek cel ch- chb chc che chh chk chl ckb ckc ckh cl- clb clc cle clh clk cll ebb ebc ebe ebh ebk ebl ec- ecb ecc ece ech eck ecl eeb eec eee eek eel ehb ehc ehe ehh ehl ekb ekc eke ekh ekl elb elc ele elh elk ell hbb hbc hbe hbh hbk hbl hcb hcc hce hch hck hcl he- heb hec hee heh hek hel hhb hhc hhe hhh hhk hhl hkb hkh hkk hkl hlb hlc hle hlh hll kbb kbc kbe kbh kbk kbl kcb kcc kce kch kck kcl ke- keb kec kee keh kek kel khe khh khk kkb kkc kke kkh kkk kkl kl- klb klc klh lbb lbc lbe lbh lbk lbl lcb lcc lce lch lck lcl leb lec lee leh lek lel lhb lhc lhh lhk lkb lkh lkl llb llc lle llk lll