bbb bbc bbe bbf bbk bcb bcc bce bcf bcj bck be- beb bec bee bef bek bfb bfc bfe bff bfj bjc bjf bjj bjk bkb bkc bke bkf bkk c-- c-j cbb cbc cbe cbf cbj cbk ccb ccc cce ccf ccj cck ce- ceb cec cee cef cej cek cfb cfc cfe cff cfk cjb cjc cjf cjk ckb ckc ebb ebc ebe ebf ebj ebk ec- ecb ecc ece ecf ecj eck eeb eec eee eef eek ef- efb efc efe eff ejc ejf ekb ekc eke ekf fbb fbc fbe fbf fbk fcb fcc fce fcf fcj fck feb fec fee fef fek ffc ffe fff ffk fjb fjc fkb fkc fkf fkj fkk jbc jbf jbj jbk jcb jcc jce jcf jck jeb jec jee jef jej jek jfb jfc jfe jff jfj jfk jjb jjc jjf jjj jjk jkb jkk kbb kbc kbe kbf kbk kcb kcc kce kck ke- keb kec kee kef kek kfc kff kjb kjc kje kkb kkc kke kkk