How to use If-and-only-if in a sentence

if-and-only-if
  • One can read it as " j double arrow y "; or as " j if and only if y " .

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  • Strings are considered false if and only if they are empty. null and undefined are considered false.

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  • One can read it as " j double arrow y "; or as " j if and only if y ".

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  • With any move, you can swap two adjacent stones' positions - but if and only if the swap makes a string of three or more identical stones.

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