The term immunodeficiency is identified in base64 scheme by the sequence aW1tdW5vZGVmaWNpZW5jeQ==, while the MD5 signature is equal to 1f220b3fcd0f2934cbb89380f0251972. The ASCII encoding of immunodeficiency in hexadecimal notation is 696d6d756e6f646566696369656e6379.