java code:

suppose the following variables are defined:

paraphrase the following code and make it shorter:

while (n >= 1) { if (!first.isEmpty() && n <= first.size() && n > 0) { if (!s1 || ((first.size() - n) ^ (second.size()) ^ (third.size()) ^ (fourth.size())) == 0) { System.out.println("The computer has removed " + n + " sticks from row 1"); while (n > 0) { first.remove(0); n--; } } } if (!second.isEmpty() && n <= second.size() && n > 0) { if (!s1 || ((second.size() - n) ^ (first.size()) ^ (third.size()) ^ (fourth.size())) == 0) { System.out.println("The computer has removed " + n + " sticks from row 2"); while (n > 0) { second.remove(0); n--; } } } if (!third.isEmpty() && n <= third.size() && n > 0) { if (!s1 || ((third.size() - n) ^ (second.size()) ^ (first.size()) ^ (fourth.size())) == 0) { System.out.println("The computer has removed " + n + " sticks from row 3"); while (n > 0) { third.remove(0); n--; } } } if (!fourth.isEmpty() && n <= fourth.size() && n > 0) { if (!s1 || ((fourth.size() - n) ^ (second.size()) ^ (third.size()) ^ (first.size())) == 0) { System.out.println("The computer has removed " + n + " sticks from row 4"); while (n > 0) { fourth.remove(0); n--; } } } n--; }