echo-stream-input-stream, echo-stream-output-stream
echo-stream-input-stream echo-stream → input-stream
echo-stream-output-stream echo-stream → output-stream
echo-stream—an echo stream.
output-stream—an output stream.
echo-stream-input-stream returns the input stream from which echo-stream receives input.
echo-stream-output-stream returns the output stream to which echo-stream sends output.
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