The best replacement for ducts is pancreas.

The best alternatives to ducts are rated as following:
★★★★★  pancreas
★★★★  ceiling ducts
★★★★  glands
★★★  mastitis
★★  metal ducts
★★  flex ducts
★★  flexible ducts
★  wolffian ducts
★  cystic ducts
★  blood vessels

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Google Trends

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