The term positive reinforcing stimulus is identified in base64 scheme by the sequence cG9zaXRpdmUgcmVpbmZvcmNpbmcgc3RpbXVsdXM=, while the MD5 signature is equal to 0cb1bbd53b833943ff62e417c0472f30. The ASCII encoding of positive reinforcing stimulus in hexadecimal notation is 706f736974697665207265696e666f7263696e67207374696d756c7573.