The term external-combustion engine is identified in base64 scheme by the sequence ZXh0ZXJuYWwtY29tYnVzdGlvbiBlbmdpbmU=, while the MD5 signature is equal to d4d87feef057f159658147de05fa0891. The ASCII encoding of external-combustion engine in hexadecimal notation is 65787465726e616c2d636f6d62757374696f6e20656e67696e65.