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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 async def async_current_transfer_human_readable( self, use_cache=True):
 """Gets current transfer rates in a human readable format."""

        rx, tx = await self.async_get_current_transfer_rates(use_cache)

        return "%s/s" % convert_size(rx), "%s/s" % convert_size(tx)