Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Cosco #11-435-WBL White 2 Step Fold Stool
Product description: 2 Step, White, Folding Step Stool With Abrasion Resistant Opti-Bond, Powder Coated Steel, Easy Fold & Compact Storage, Heavy Duty Slip Resistant Steps, Packed 4 Per Carton.
Product feature: Cosco #11-435-WBL White 2 Step Fold Stool, COSCO HOME & OFFICE-IMPORT
Product brand: COSCO HOME & OFFICE-IMPORT
Target attributes: Number of Steps
Answer: attribute: number of steps
value: 2 step
source: product feature
attribute: number of steps
value: 2 step
source: product title
attribute: number of steps
value: 2 step
source: product description