bbbb bbci bbeb bcbc bccc bcci bcec bcie bebb bebe bebi beci beck beeb beek beic beik beke beki bibb bibe bibi bicc bice bici bick bieb bike cbbc cbcc cbce cbec cbee ccbc cccb cccc ccci ccee ccic ccii cec- cece ceci ceeb ceec ceke cibc cibe cibi cicc cici ciee ciii ckbc ckbe ckbi ckck ebbc ebcc ebic ecbc ecbe eccb eccc ecce ecci ecib eeee eeke eick eiec eiei eike eiki ekeb ekek ekki i-be ibec ibie icbc iccb iccc icci icec icee icke iecc ieie iiie iiii ikee ikki k-ci kbbb kbbc kbbe kbbi kbbk kbcb kbce kbci kbck kbeb kbec kbee kbek kbib kbic kbie kbik kbkb kbkk kcbc kcbi kcbk kccb kccc kcci kcck kceb kcec kcee kcei kcic kcie kcii kckc kckk kebb kebc kebe kebi keck keek keib keii keik kekb kekc keke keki kibb kibc kibe kibi kicb kicc kice kick kiic kiii kiik kikc kiki kikk kkbb kkbe kkbi kkcb kkci kkck kkic kkik kkkk