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 * $$||(4,3)|| = 5$$
 * 1) * 2002, S. Long et al., A Meshless Local Petrov-Galerkin Method for Solving the Bending Problem of a Thin Plate, Tech Science Press
 * For the purpose of error estimation and convergence studies, the deflection and energy norm, ||w|| and ||e||, are calculated [...]
 * 1)  delimiter for morphophonemic transcription
 * 1)  delimiter for morphophonemic transcription