CREATE TABLE table_name_50 (format VARCHAR(255), label VARCHAR(255), region VARCHAR(255), date VARCHAR(255))
What is the format for the label Mightier than Sword on January 12, 2010 in the United States?
    
SQL: SELECT format FROM table_name_50 WHERE region = "united states" AND date = "january 12, 2010" AND label = "mightier than sword"