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							 | 
							
								var Stream = require('stream');
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							 | 
							
								if (process.env.READABLE_STREAM === 'disable' && Stream) {
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								  module.exports = Stream;
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								  exports = module.exports = Stream.Readable;
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								  exports.Readable = Stream.Readable;
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								  exports.Writable = Stream.Writable;
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								  exports.Duplex = Stream.Duplex;
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							 | 
							
								  exports.Transform = Stream.Transform;
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								  exports.PassThrough = Stream.PassThrough;
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							| 
								
							 | 
							
								  exports.Stream = Stream;
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							 | 
							
								} else {
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								  exports = module.exports = require('./lib/_stream_readable.js');
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							 | 
							
								  exports.Stream = Stream || exports;
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							| 
								
							 | 
							
								  exports.Readable = exports;
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							| 
								
							 | 
							
								  exports.Writable = require('./lib/_stream_writable.js');
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							| 
								
							 | 
							
								  exports.Duplex = require('./lib/_stream_duplex.js');
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							| 
								
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								  exports.Transform = require('./lib/_stream_transform.js');
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							 | 
							
								  exports.PassThrough = require('./lib/_stream_passthrough.js');
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							| 
								
							 | 
							
								}
							 |