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: ASUS F555 Core i5 Laptop [2014 Model Previous Gen CPU]
Product description: ASUS X555LA-DB51 15.6 Inch HD Laptop (Black), Intel Core i5-4210U 1.7GHz (Turbo up to 2.7GHz) Has well, 8GB DDR3L (1600MHz), 1TB 5400RPM, DL DVDRW/CD-RW, 802.11BGN, Bluetooth, Windows 8.1
Product feature: Intel Core i5-4210U 1.7 GHz Processor (Turbo up to 2.7GHz), 8 GB DDR3L SDRAM, 1024 GB 5400 rpm Hard Drive, 15.6-Inch Screen, Windows 8.1
Product brand: Asus
Target attributes: Processor Brand
Answer: attribute: processor brand
value: core i5
source: product title
attribute: processor brand
value: intel core
source: product description
attribute: processor brand
value: intel core
source: product feature