describe  -- Command, one input.
     The input must be the name of a Logo primitive procedure.  A brief ex-
     planation of that primitive is typed at your terminal.

     In addition, the input may begin with a "?". In this case, LOGO will
     type at your terminal the names of all the LOGO commands whose names
     or abbreviations contain the input string. If the input is just "?", 
     the names of all the LOGO primitive procedures will be typed at your
     terminal.
     
     EXAMPLES:  describe "print
                describe "?pri

