Four children are arguing over a broken toy. Ali says Barbara broke it. Barbara says Tyler broke it. Tyler and Hei-Lam say they do not know who broke it. Only the guilty child was lying. The child who broke the toy was?
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Consider all the choices. Only the guilty child is lying. If Hei-Lam broke it, Barbara and Ali would both be lying. If Tyler broke it, Ali would be lying. If Ali broke it, Barbara would be lying. If Barbara broke it, only she would be lying, therefore she broke it.