150596
After Starscream 's returning to the D-Base , the Skyboom Shield ( together with the other two Mini-Con super-weapons ) was used by Megatron as the power source for the Hydra-Cannon .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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