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Continue to ChatLet's do the wave! Longitudinal or transversal? https://mirjamglessmer.com/2014/08/13/lets-do-the-wave-longitudinal-or-transversal/
Let's do the wave! Longitudinal or transversal? https://mirjamglessmer.com/2014/08/13/lets-do-the-wave-longitudinal-or-transversal/