O'Brien-Fleming boundary
Pocock boundary
Wang-Tsiatis boundary with Delta = 0.25
Hwang-Shih-DeCani spending function compressed to 0.2, 0.8 with gamma = 1
Hwang-Shih-DeCani spending function trimmed at 0.2, 0.8 with gamma = 1
argument 4 (type 'list') cannot be handled by 'cat'
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