C died of poisoning  For this reason, A and B were interrogated by the judge  A said that if it was murder, it must have been done by B  B says that if it's not suicide, it's murder  The judge made the following assumptions: (1) if neither A nor B lied, then it was an accident  (2) if one of A and B lied, then it was not an accident
C is suicide
 The final facts show that the judge's assumption is correct