Because sometyms thy dnt knw its a mistake or at times thy thnk thy hv nt commited any mistake at al!!
tht's human nature...........
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The brain is the memory.
Sometimes, when we do a job our brain remembered the actions and it repeats the action without knowing.
Eg: Sometime when something is given to do, we feel distracted and forget the work and when it's remembered we repeat again the action unknowingly.
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