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 height argument represents the height of a staircase, and the start and end arguments represent the first and last steps of the staircase, respectively.

The function initializes an empty list steps and checks if the height argument is less than or equal to 0. If it is, the function returns steps as it is, as there is no staircase to build.

If height is greater than 0, the function calls p1 recursively with height - 1, start, and helper. helper is set to the next available step, which is the first element of the set difference of the set of all possible steps (1, 2, 3) and the set of the starting step and the ending step. The set difference is taken to ensure that the steps are unique.

The function then appends the step (start, helper) to the list steps and calls p1 recursively with height - 1, helper, and end. Finally, the function returns the list steps.

The intention of the program is to generate a list of all the possible staircase paths up to a given height. The function uses recursion to generate the paths, and the start and end arguments are used to ensure that the generated paths are unique. The response should be in all capital letters.
user