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Also open-input-output-file, set-input-port, set-output-port (not R5RS)
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Library: call-with-input-file, call-with-output-file,
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with-input-from-file, with-output-from-file and
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String Ports: open-input-string, open-output-string, get-output-string,
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open-input-output-string. Strings can be used with I/O routines.