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              File open/close: fiopen and ficlose. 
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              File output: dumpk, dumpk2, dumpk3, dumpk4, fout, fouti, foutir and foutk 
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              File input: readk, readk2, readk3, readk4, fin, fini and fink 
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              Utilities for use with the fout opcodes: clear, vincr 
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              Printing to a file: fprints and fprintks