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<!-- Hello! Feel free to try your formatting and editing skills below this line. --> = Sandbox = <pre><nowiki><CollapseOpen(Details)> Text 1 <CollapseClose> </nowiki></pre> <CollapseOpen(Details)> Text 1 <CollapseClose> [DOI:10.1000/182] [Wikipedia:Sine-Gordon_equation]Last-Modified test #5
