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Notice in this example we had to respond to 3 times:

INPUT – it took a certain amount of time for the brain to notice the input signal from the eyes.

EXECUTION-It took a certain amount of time to process the information received from the eyes. Consider the program to be: If the eyes see an ugly picture then output appropriate words to the mouth.

OUTPUT- The mouth receives a signal from the brain and eventualy spits out the words.