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                          (CommandSubPart
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                              (CommandList
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                  iter_words: [{(sh)} {(perl)} {(py)}]
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                    (DoGroup
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                                    (DQ ($ VSub_Name '$base') (' is builtin but ') 
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                                (Assignment
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                      spids: [151 189]
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                  spids: [143 16777215]
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        (ControlFlow token:<ControlFlow_Exit exit> arg_word:{($ VSub_Name '$bad')})
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