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<?phpnamespace ParagonIE\CipherSweet\Contract;
 
 /**
 * Interface TransformationInterface
 * @package ParagonIE\CipherSweet\Contract
 */
 interface TransformationInterface
 {
 /**
 * Implementations can define their own prototypes, but
 * this should almost always operate on a string, and must
 * always return a string.
 *
 * @param mixed $input
 * @return string
 */
 public function __invoke($input);
 }
 
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