On Sampling and Sorting of Pebbles and Cobbles on Shores, a Reply to Matti Seppälä’s Comment on "Shape Development of Trondhjemite Pebbles and Cobbles on Shores in the Southwestern Finnish Archipelago", by Mauri Pyökäri (1980) - Pyökäri, Mauri (Géographie physique et Quaternaire, 1982)