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To achieve on what we have planned there shall be a process involved. Every process from an input to became the output will need an entry and exit points
To make it more clear, let take an example on our daily live. We have to take an example that definitely has an entry and exit points.
An easy case is when we are hungry so that we need a food to eat. If we don't eat the hungry will not became an end point, it is stack there. You can see easily find that this process will need to be settled in order to continue our living.