The term propositional calculus is identified in base64 scheme by the sequence cHJvcG9zaXRpb25hbCBjYWxjdWx1cw==, while the MD5 signature is equal to b20c9c64e7c7bb157afab06b41732e93. The ASCII encoding of propositional calculus in hexadecimal notation is 70726f706f736974696f6e616c2063616c63756c7573.