The THRU range is a compound range that specifies all lines between two
 single line ranges.

 Format: range-1 THRU range-2
     Or: range-1 : range-2

 Both forms are equivalent.  Starting with range-1, EDT selects all the
 lines up to and including the line specified by range-2.

 Ex: TYPE 15:30       Display all lines with numbers between 15 and 30.

     TYPE 'glorp':END Display all lines from the first line forward
                      containing 'glorp' to the end.