4.01. Ποτάμια/Ρυάκια μόνιμης ροής [περιλαμβάνονται οι καταρράκτες]

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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith