Do exercise 3 from section 3.10 but make all your definitions arrays of data. Have some of your arrays DUP'd and count some using the $ operator. You should leave one of the DUP'd arrays uninitialized.
This assignment is Level 1.5.
Add (Level 1) to define a 2D array initialized with a single DUP directive.
Add (Level 0.5) to use a DUP to initialize an array to a repeating pattern -- anything will do.