Connect 4


 * _ | _ | _ | _ | _ | _ | _ |
 * _ | _ | _ | _ | _ | _ | _ |
 * _ | _ | _ | _ | _ | _ | _ |
 * _ | _ | _ | _ | _ | _ | _ |
 * _ | _ | _ | _ | _ | _ | _ |
 * _ | _ | _ | _ | _ | _ | _ |