Exercises 51-53 relate to inhabitants of an island on which there are three kinds of people: knights who always tell the truth, knaves who always lie, and sples who can ether tell the truth or le. You enounr three people, A, B, and C. You knmow one of the three people is a knight, one is a knave, and one is a spy. Each of the three people knows the type of person each of the other two is. For each of these situations, if possible, determine whether there is a unique solution, list all possible solutions or state that there are no solutions. 51. A says "I am not a knight, B says "I am not a spy, and C says I am not a knave." 52. A says "I am a spy," B says I am a spy" ad C says "B is a spy. 53. A says "I am a knight," B says I am a knave," and C says "I am not a knave