Rank the following dienes in order of increasing reactivity in a Diels-Alder reaction, listing the least reactive first. 
Definitions:
Discount
The reduction applied to the face value of a bond or the lower than market price of an asset.
Par Value
The face value of a bond or stock as stated by the issuing company, which may differ from its market value.
Market Rate
The prevailing price or interest rate available in the marketplace for goods, services, or securities.
Coupon Rate
The coupon rate is the annual interest rate paid by a bond relative to its face value, expressed as a percentage.
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