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(228.6KB, 1105x1505) >>612
Thinking is only one of many processes that comprise existing. Some would say there are infinitely many such processes as part of a greater system.
With the context of sustaining human consciousness or life, conscious cognitive activity is not as relevant as, e.g. the unconscious activity which allows your heart to beat, your stomach to digest food and your lungs to absorb oxygen from your environment (which in turn directly powers brain function).
>I do a lot of things whether I am aware of them all or not, therefore I am.