Overview of Sort / Merge / Deduplicate / Split in few steps

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Step 5: Merging several files

We now specify 2 input files to merge: it's as simple as just adding another INPFIL statement.
SKIP_HEADER removes header only from first input file. As all of our input files include header, we now use SKIP_HEADERS to suppress header on every input file.
We get 501 - 1 + 501 - 1 = 1000 output lines
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