Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Sylvania 6424FF 24" Flat Screen CRT TV
Product feature: 24" Pure Flat Picture Tinted picture tube for better conrast and viewing angle(less Glare), Trilingual OSD, Advanced digital Comb Filter, CCD/V-Chip/Sleep Timer, Front and Rear AV inputs/S-Video inputs
Product brand: Sylvania
Target attributes: Viewing Angle
Answer: attribute: viewing angle
value: None
source: None