1 strategy for resolving this case is taken in Poland, in which CEE 7/five sockets are usually set up in pairs, the upper (upside-down) 1 possessing the "French" polarity as well as the decreased just one acquiring the "Czech" polarity, so the user can pick what to plug in which. https://types-of-electrical-plugs19528.glifeblog.com/28760555/top-guidelines-of-connectors-electrical-types