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Each year your contacts database will decay, so to successfully cater to the needs and interests of your contacts, what do you need to begin with?

Below is the answer and explanation for each year your contacts database will decay, so to successfully cater to the needs and interests of your contacts, what do you need to begin with?   Each year your contacts database will decay, so to successfully cater to the needs and interests of your contacts, what do you need to begin with?