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                                    I am system 'X'. I have ducts. My secretions act at the site of secretion. I have a counter system which is 'Y' and it has the opposite set of properties. Identify me and my counter system. | 
                            
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Answer» I am system 'X'. I have ducts. My secretions act at the site of secretion. I have a counter system which is 'Y' and it has the opposite set of properties. Identify me and my counter system. | 
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