a3.ads, construct your own package body (preferably using the file name
a3.adb), and be able to link both of these to the test procedure in the file
a3test.adb. The first and third of these are available from the class web site. You should not need to make changes to the third file.
You needn't reclaim storage or use exceptions.
If lookup fails, you should print a short error message. If it succeeds, please print only the appropriate binding value. Note that the type of this binding value is a distinct type from the