Problem
1. Write a procedure to implement the unoost Structure function on a raster system.
2. Write a procedure to implement the del etc Structure function on a raster system.
3. Write a procedure to implement highlighting as a blinKing operation.
4. Write a set of routines for editing structures. Your routines should provide for the fol-lowing types of editing: appending, inserting, replacing, and deleting structure elements.