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(*use open() here)  - Open the filehandle FH
(*use array and FH) - Slurp all lines from FH to Array
(*use seek here)    - Go to a position in the file
(*etc....)

COL-1    COL-2    COL-3    COL-4
Line #1
...
Line #3
Line #4
Line #5

COL-1    COL-2    COL-3    COL-4
Line #2
...
Line #4
Line #5
Line #6