title: remove a sub set from set in Clingo
body: <p>I am new to Clingo and encountered a situation where I needed to remove a subset from the answer set. For example, I have <code>p(1..9).</code> and I want to remove <code>p(5)</code> from my answer set. How can I do it? Without creating a new answer set? Consider that I have just one answer set as result and if I remove it with <code>:- p(5).</code> the program will result in unsatisfaction.</p>