P1.8.8 is a sub part for 1.7.9

P1.7.9 Here we have another islander problem as in Problem 1.6.9. There are three islanders: A says "If B and I are both telling the truth, then so is C, B says "If C is telling the truth, then A is lying, and C says "It is not the case that all three of us are telling the truth." Using propositional variables a, b, and c to represent the truth of the statements of A, B, and C respectively, we can represent the problem by the three premises a + ((a vb) c), bH (c + na), and c H (a Ab Ac). Determine the conclusion as a conjunction of three literals, and give a deductive sequence proof of this conclusion from the premises. P1.8.8 Consider the islander problem of Problem 1.7.9. For each of the three islanders, either derive a contradiction from the assumption they are telling the truth, or derive a contradiction from the assumption that they are lying. P1.7.9 Here we have another islander problem as in Problem 1.6.9. There are three islanders: A says "If B and I are both telling the truth, then so is C, B says "If C is telling the truth, then A is lying, and C says "It is not the case that all three of us are telling the truth." Using propositional variables a, b, and c to represent the truth of the statements of A, B, and C respectively, we can represent the problem by the three premises a + ((a vb) c), bH (c + na), and c H (a Ab Ac). Determine the conclusion as a conjunction of three literals, and give a deductive sequence proof of this conclusion from the premises. P1.8.8 Consider the islander problem of Problem 1.7.9. For each of the three islanders, either derive a contradiction from the assumption they are telling the truth, or derive a contradiction from the assumption that they are lying