Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Sony VAIO EL2 VPCEL22FX/B 15.5" Laptop (Black)
Product description: Whether it is open or closed, you will find yourself wanting to feel this VAIO E Series laptop. With a textured, diamond-shaped pattern embossed on the lid and palm rest, this PC is artfully crafted to be pleasing to the eyes and to the touch without leaving any fingerprint smudges.
Product feature: AMD E Series Processor 1.65GHz, 4GB DDR3 RAM, 320GB 5400RPM Hard Drive, 15.5-Inch Screen, AMD Radeon HD 6320, Windows 7 Home Premium, 5.4 hours Battery Life
Product brand: Sony
Target attributes: Weight
Answer: attribute: weight
value: None
source: None