bbbb bbch bbeb bbox bcbc bccc bcec bche bebb bebe bebo bech beeb beo- bhcc bobb bobe bobo boce boch boco boec boee boeo boho boob booc booe booh boox c-bo cbbc cbcc cbce cbec cbee cbox ccbc cccb cccc ccee cche ccob ccoc cec- cece ceco ceeb ceec cexe chce chch cheb chec chee cheh chex choc choh choo cobb cobe cobh cobo coce coch coco coex coho coob cooh coxe cxxx ebbc ebbo ebcc eboe eboo ebox ecbc ecbe eccb eccc ecce ecco eche echo eco- eeee eeoc ehcc eheh exch exco exec exh- exo- hboc hbox hcbc hccb hccc hcch hebb hebe hebo hech heeb hehe heho hex- hexb hexe hhex hhhh hobe hobo hoce hoch hohe hoho hooe hoox o-eo obbo obec obex oboe obox ocbc occc oce ocee oche oec- oecc oeec ohbe ohcc ohee ohho ohob ohoh oobe ooho oooh oooo oxo- oxox oxxo xbee xbox xexe xobc xoco xoxo xxxo xxxx