summarize the interventions in a list in order that is used in the following text: "Participants will receive pembrolizumab 200 mg intravenously (IV) every 3 weeks (Q3W) in combination with 3 cycles of the investigator's choice of platinum doublet chemotherapy and concurrent standard thoracic radiotherapy (60 Gray (Gy) over 6 weeks) followed by pembrolizumab plus olaparib placebo twice a day (BID) for approximately 1 year." Provide response in all capital letters, no lowercase letters allowed.
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