Provide a neatly drawn mechanism for the following reaction, including curved arrows to show the movement of pairs of electrons and the structure of reactive intermediates. 
Definitions:
Trade-In Allowance
The amount credited to a customer for the trade-in of a used item towards the purchase of a new item.
Book Value
The net value of an asset reported in the financial statements, calculated as the original cost minus any depreciation, amortization, or impairment costs.
Accumulated Depreciation
The cumulative sum of depreciation costs charged to a fixed asset from the time it was first utilized.
Accumulated Depreciation
The aggregate cost of a tangible asset that has been recognized as depreciation since the asset's initial use.
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