直击嫦娥六号发射瞬间 火箭顺利起飞火焰划破长空奔向月球 编辑：杨雁琳责编：吴忠兰审核：冯飞
Imagine I have a stack-based toy language that comes with the operations Push, Pop, Jump and If. I have a program and its input is the toy language. For instance I get the sequence
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