- Athree-prongedspearusedinfishing.Thissocketonlyacceptsatwo-prongedplug.Notallplugsarethreeprongedandsometoolshaveonlyatwoprongplug.HowwasItoknowArgentinausedthosequirkilyangledthree-prongedplugs?Thecoursewearejointlypursuingisnotabluntassault,butadiv...
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