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Top: A tetrahedron compatible with +1/2 disclination on each vertex can be constructed using a parallelogram, by folding along the dashed lines. A constant nematic director field in the unfold parallelogram is shown by the array of parallel straight lines. After folding up, the angles with same color circle around the same vertex. Bottom: The tetrahedron obtained via folding. There is exactly one +1/2 disclination on each vertex of the tetrahedron.
