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schema = StructType([ \
      StructField("firstname", StringType(), True), \
      StructField("middlename", StringType(), True), \
      StructField("lastname", StringType(), True), \
      StructField("id", StringType(), True), \
      StructField("gender", StringType(), True), \
      StructField("salary", IntegerType(), True)                  
    ])