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<?php const ✓ = true; const ✕ = false; function ≠($left, $right) { return $left != $right; } function ≅($left, $right) { return ($left > $right - 0.0001) && ($left < $right + 0.0001); } function ≡($left, $right) { return $left === $right; } function ≢($left, $right) { return $left !== $right; } echo ✕;
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