Generate a Python program that has the following intention:

The program defines a recursive function p1 that takes three arguments: height, start, and end. The function's purpose is to generate a list of all possible paths that connect the points start and end using the given number of steps, where each step can only be a move to an adjacent point in a given direction.

The function first checks if the height argument is less than or equal to 0. If it is, the function returns the empty list, indicating that there are no paths that can be generated.

If height is greater than 0, the function uses a helper function to generate all possible paths using a smaller number of steps, starting from height - 1. The helper function is defined using a set difference operation that removes the start and end points from a set of all possible points (represented by the set {1, 2, 3}). The resulting set is then popped to get the next available point.

The function then appends the start and end points to the generated list of paths, and recursively calls itself with a smaller height and the helper point as the start and end points.

The function returns the list of all paths generated by the recursive calls and the helper function.

In summary, the program defines a recursive algorithm that generates all possible paths between two points using a given number of steps, where each step can only be a move to an adjacent point in a given direction. The algorithm uses a helper function to generate paths with a smaller number of steps, and then recursively calls itself to generate paths with more steps. Your entire response should be in English, and in all capital letters.
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