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You need to know what the double unary operator (--) does in Excel
It's marginally more efficient: While the difference is negligible, the double-unary operator can be more efficient in ...
//In some scripting languages like PHP, there exists a logical operator (e.g. &&, ||, and, or, etc.) called the "Exclusive Or" (hence the name of this Kata). // The exclusive or evaluates two booleans ...
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