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Regional clusters of arrangements are grouped in 5 main regions (Atlantic, Pacific, Indian ocean, Inland seas and Polar regions). Individual arrangements are shown as a shade of gray: the more the arrangements overlap an area the darker it is. To show or hide a cluster, click on the check button in front of its name. To see the relation between a regional cluster and related issues, click on its name.

    1 arrangement     2 arrangements     3 arrangements     4 arrangements     5 arrangements or more