1. Construct a data dictionary and draw a hierarchy chart and flowchart or pseudocode for a program that merges three sales files (SALES1, SALES2, and SALES3).
Output: Output is the merged file. The records are identical in format to the input files. The file should contain all records from SALES1 first, followed by all records from SALES2, followed by all the records from SALES3.
**USE A DATA DICTIONARY, HIERARCHY CHART, FLOWCHART and PSEUDOCODE TO SHOW YOUR SOLUTION**