Explain the mechanism of [4+2] cycloaddition reaction.

The [4+2] cycloaddition reaction, also known as the Diels-Alder reaction, is a pericyclic reaction where a diene (a molecule containing two conjugated double bonds) reacts with a dienophile (a molecule containing a double bond or triple bond) to form a six-membered cyclic structure. This reaction is a classic example of a concerted mechanism, meaning that the bond-making and bond-breaking occur simultaneously in ________ _________ ______ _____ _______ ______ ________ ________ __________.
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