The term circle of willis is identified in base64 scheme by the sequence Y2lyY2xlIG9mIHdpbGxpcw==, while the MD5 signature is equal to 8fe80a8ce7b0c1c10f9ade2f5b8656ce. The ASCII encoding of circle of willis in hexadecimal notation is 636972636c65206f662077696c6c6973.