[1] "O'Brien-Fleming boundary"
[1] "Pocock boundary"
[1] "Wang-Tsiatis boundary with Delta = 0.25"
[1] "Hwang-Shih-DeCani spending function compressed to 0.2, 0.8 with gamma = 1"
[1] "Hwang-Shih-DeCani spending function trimmed at 0.2, 0.8 with gamma = 1"
[1] "Hwang-Shih-DeCani spending function no spending in 0.2, 0.8 with gamma = 1"
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