Explanation of the Gelfond Lifschitz reduct
Due to b(j)., c(j):- a(j), not b(j). is not applicable and needs to be removed.
As all negated literals are deleted, c(i):- a(i), not b(i). is converted to c(i):- a(i).
Therefore, as I = {a(i), b(j), c(i), d(i, j, i)} is minimal representation of the remaining P, it is also stable.