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If you have polyspidrons, you can take off the pieces yellow-coloured above (which are all the trispidrons without head) to realize the shapes of stelo : to stelo we can notice that the 12 pieces of stelo cover an area 36 ; if we double its dimensions, we obtain a form with area 144 (36 x 2²), which we can realize by the pieces of polyspidrons ; s