exercise in prolog



hi!
i got a little problem. we have to implement a program for prolog.
that's the situation:
we got some person who say something about another person. for
example:

a says: b lies when c says the truth.
b says: a says the truth.
c says: b lies.

that's only an example. our task is harder.

anyone has a hint for me? shall I use lists? in addition, we should
use the facts: bool(true) and bool(fail).

thanks for every answer!

.



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