Relate to Inhabitants of an Island on Which There Are $$A \text { says "I am a spy," } B \text { says "I am a spy" and } C \text { says " } B \text { is a spy." }$$

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 spies who can either tell the truth or lie. You encounter three people,
A, B, and C. You know 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.
- $$A \text { says "I am a spy," } B \text { says "I am a spy" and } C \text { says " } B \text { is a spy." }$$