A common sight in ‘smart homes’, door sensors allow you to detect whether a door is closed or open, enabling the triggering ...
2.https://sifatshishir.blogspot.com/2018/01/light-oj-hints.html 3.https://ishtiaqhimu.blogspot.com/2019/06/beginners-problems-light-oj-hints.html?showComment ...
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