What is a method I can use to find duplicated entry within a sorted numeric file? I was trying to read a file reading two lines at once but apparently, I can only read one line at a time. Can the same file be opened and read two times within a program?

For example, a file has:

1
2
2
3
4
4
5
6
6

The newly revised file should be:

1
2
3
4
5
6

Again, thanking the group for their input,

Ken






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