The term notational system is identified in base64 scheme by the sequence bm90YXRpb25hbCBzeXN0ZW0=, while the MD5 signature is equal to db69bd1ebfc5a1115928f5e072809cb5. The ASCII encoding of notational system in hexadecimal notation is 6e6f746174696f6e616c2073797374656d.