docs: function (x1, y1, x2, y2) {
              for (var orientation in wordfind.orientations) {
                  var nextFn = wordfind.orientations[orientation];
                  var nextPos = nextFn(x1, y1, 1);
                  if (nextPos.x === x2 && nextPos.y === y2) {
                      return orientation;
                  }
              }
              return null;
          }