The term extension course is identified in base64 scheme by the sequence ZXh0ZW5zaW9uIGNvdXJzZQ==, while the MD5 signature is equal to 58dd4a8c00eec3ac2dafbebdc172e9a9. The ASCII encoding of extension course in hexadecimal notation is 657874656e73696f6e20636f75727365.