Explain why the following (2+2)cycloaddition reaction would work under photochemical conditions but not under thermal conditions. 
Definitions:
Parent Organization
A larger, overarching entity that owns or controls smaller entities or subsidiaries.
Probability Density Function
A mathematical function that specifies the probability of a continuous random variable falling within a particular range of values.
Continuous Random Variable
A variable that can take an infinite number of values within a given range, with each possible value being associated with a probability.
Random Variable
A variable whose numerical values result from a random phenomenon or statistical experiment.
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