There are several ways of folding the base form "catamaran" based on different basic shapes. This model is hard to call the base, but it also starts from a lot of the classic models of origami.

the basic form of the «catamaran» figure 1the basic form of the «catamaran» scheme 2the basic form of the «catamaran» figure 3the basic form of the «catamaran» figure 4the basic form of the «catamaran» scheme 5

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