An amusement park has two entrances where they collect data about their customers. The data file for the south entrancePreview the document has an S (for south) followed by the customers' pass numbers, the size of their parties, and their ages. The data file for the north entrancePreview the document has an N (for north), the same data as the south entrance, and then, since the north entrance has multiple parking lots, one more column for the parking lot where they left their cars. Your job is to read the data files into two SAS data sets called south and north, respectively, and then interleave the two data sets to create a combined data set called entrances that when printed looks like this: