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{2.^(-1), 2.^(-6^(-1)), 2.^(-6^(-12^(-1))), 2.^(-6^(-12^(-20^(-1)))), 2.^(-6^(-12^(-20^(-30^(-1))))), 2.^(-6^(-12^(-20^(-30^(-42^(-1)))))), 2.^(-6^(-12^(-20^(-30^(-42^(-56^(-1)))))))}
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