The term closed couplet is identified in base64 scheme by the sequence Y2xvc2VkIGNvdXBsZXQ=, while the MD5 signature is equal to 22ae36b4ad8c9122d57d2d5789a73f6d. The ASCII encoding of closed couplet in hexadecimal notation is 636c6f73656420636f75706c6574.