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By Heather Somerville SAN FRANCISCO (Reuters) – Mobile payments company Square Inc set a price range on Friday for its highly anticipated initial public offering that values the company at up to $4.2 billion, a 30 percent discount to its valuation at its last fundraising round. San Francisco-based Square, which is headed by Twitter Inc Chief Executive Jack Dorsey, is one of the most prominent “unicorns,” or private companies valued at more than $1 billion, to make a public debut this year