The term reinforcing stimulus is identified in base64 scheme by the sequence cmVpbmZvcmNpbmcgc3RpbXVsdXM=, while the MD5 signature is equal to 8b0867a7b12334a5812b09bdd75f66a9. The ASCII encoding of reinforcing stimulus in hexadecimal notation is 7265696e666f7263696e67207374696d756c7573.