The term functional calculus is identified in base64 scheme by the sequence ZnVuY3Rpb25hbCBjYWxjdWx1cw==, while the MD5 signature is equal to c51ac5245f7312fb7da4097f9fee5217. The ASCII encoding of functional calculus in hexadecimal notation is 66756e6374696f6e616c2063616c63756c7573.