The opcodes for file input and output are:
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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