The awk extraction and reporting language does not provide any markup facility for embedding here documents within an awk script. The awk utility is really a helper tool often used from within the Unix shell. The Unix shell in which awk scripts are usually embedded does support the use of here documents, and the way that here documents are used within the shell make them ideal for passing to awk as is, without the need for an additional facility in awk.
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This change is a minor edit.
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