ANSWERS: 2
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Hindsight is 20/20: Perfect understanding of an event after it has happened; - a term usually used with sarcasm in response to criticism of one's decision, implying that the critic is unfairly judging the wisdom of the decision in light of information that was not available when the decision was made.
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20/20 refers to optometrists' measurement for perfect sight. Hindsight is "looking back (over time) 20/20 Hindsight is thus a perfect view of the past using today's knowledge
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