Solve this pipe puzzle. The scene shows four square tiles, each containing a pipe segment. The tiles stay fixed in place and do not rotate; only the pipe inside each tile rotates. Rotate the pipe within each tile so that all pipe segments link up into a single continuous path. All pipes rotate at the same time and reach their final orientations together. Keep the camera view fixed in the top-down perspective and keep every tile in its original position. Only modify what the task requires; keep the background and any other element unchanged. Output 4 images at uniform intervals showing the rotation progress, ending with the solved puzzle.