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#### 21.2.44 echo-stream-input-stream, echo-stream-output-stream [Function]

`echo-stream-input-stream` echo-stream ⇒ input-stream

`echo-stream-output-stream` echo-stream ⇒ output-stream

#### Arguments and Values::

echo-stream—an echo stream.

input-stream—an input stream.

output-stream—an output stream.

#### Description::

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.