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Origami: Piramide settima e varianti - Seventh pyramid and variants, by Francesco Guarnieri. CP: http://guarnieri-origami.blogspot.it/2014/02/piramide-settima-e-variazioni.html

Origami: Piramide settima e varianti - Seventh pyramid and variants, by Francesco Guarnieri. CP: http://guarnieri-origami.blogspot.it/2014/02/piramide-settima-e-variazioni.html