Two companies within the distributor industry that use lean principles are Amazon, a large-sized company, and Unipart Group, a small- to medium-sized company that use lean principles and/or six sigma . Provide and discuss 3 challenges each company might face when either implementing lean principles, or operating under lean principles, and maintaining the high standards. This will require some online research. Please include the website and link for the reference each company Once comparison completed, provide your thoughts, observations, and Aha moments within the above topic