If you don't do a use Debug in your module, how can you ensure that dp is available to your module? In other words, if this module is used by a different program, will this (hidden) prerequisite cause the next person to use your module to use your name in an unseemly context?

I figure with the saved keystrokes I might make up the development time by the end my programming life.

.... and replace it with the search time required to look for where the dp function is defined, or if you have the right one.