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For many Americans, the pandemic has been a uniquely difficult time — full of upheaval, uncertainty and loss. But for a lucky few, it’s been full of much gain. When taken combined, the world’s 10 wealthiest people “more than doubled their fortunes from $700 billion to $1.5 trillion — at a rate of $15,000 per second or $1.3 billion a day — during the first two years of [the] pandemic…