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And this is where a result says there is life, but it's not there. On the other hand, there's a fault and negative result. And this is where it's called the fine life that was actually there. Therefore, this means there are shortcomings in our ability to recognize the existence of life. And these fault and negative are going to arise from traces of life not being preserved long enough for identification, of observable traces, of protectability, and even limitations of detection methods. And this is a problem that...