The term subarachnoid space is identified in base64 scheme by the sequence c3ViYXJhY2hub2lkIHNwYWNl, while the MD5 signature is equal to b47d4190bd6623e76670a1bba3a7b4f0. The ASCII encoding of subarachnoid space in hexadecimal notation is 73756261726163686e6f6964207370616365.