How to develop a function in the CLIPS environment?

Question

Programming languages

Hello!
I'm racking my brains on creating a function in the CLIPS environment. The function solves the following problem: Gets 2 arguments (string and number)
Searches the string for words that repeat N-th (2nd argument) number of times and removes them.
The user-defined function uses standard CLIPS environment functions to work with composite values ​​(explode$, nth$, etc.).
Help organize the algorithm of this function using the standard functions of the CLIPS environment.
Thanks in advance!