what's the difference between body, mind soul and spirit?

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I know what body is, its the physical body. I think I know what mind is, the inputs, process and outputs of the brain. (inputs=senses, process=logic/thought/feelings, output:action, conclusion) But what is soul and what is spirit? although i have a vage idea of what they are, i cant quite conclude it. can you explain it to me? what do you think/define them as?