 Recognition is a precursor to taking the correct action .
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When we see a person we know, we recognize them.  If it is a friend or loved one we smile, shake hands hug or kiss depending on who it is.
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If it is an enemy we go on guard, we tense up.
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The ramifications of not recognizing someone may have varying degrees of effect.
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Not recognizing an old acquaintance can be embarassing.