At this time, the end of the sixth millennium and the fifth millennium BC, the first Neolithic cultural groups appear in Egypt. The quantity of archaeological finds does not yet allow us to trace the merging of the Epipaleolithic traditions of the Nile Valley with the cultures of immigrant groups.
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A decahedron is a polyhedron having 10 faces. Examples include the augmented pentagonal prism (Johnson solid ), augmented tridiminished icosahedron (), nonagonal pyramid, octagonal prism, pentagonal dipyramid (, square antiprism, and square cupola ().