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eyesightlll
This is a complex question. Not everyone is the same. But, even though a person who might commit this act might not come out and say that they will, sometimes signs of them feeling this way and signs that they are planning, subtile or obvious, might be present. But, this isn’t always the case.
It’s a debatable question, but I’d say myth if it’s for a school thing, they’ll usually do something along the lines of distancing themselves suddenly from friends and family, not participating in hobbies they usually love. However sometimes there really isn’t any warning, so it really is a complex question...