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                                                          (StringUnary
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                                spids: [180 183]
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                        (assign_pair
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                        (assign_pair
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                                        arg_word: {(/dev/null)}
                                        spids: [203]
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                            left_token: <Left_CommandSub '$('>
                            spids: [197 206]
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                      do_arg_iter: False
                      body: 
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                                                {
                                                  (DQ 
                                                    (BracedVarSub
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                                                      suffix_op: 
                                                        (Slice
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                                                          length: (ArithWord w:{($ VSub_Name '$len')})
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                                                      spids: [223 229]
                                                    )
                                                  )
                                                }
                                            )
                                        )
                                      terminator: <Op_Semi ';'>
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                                  ]
                                  action: [
                                    (C 
                                      {(COMPREPLY) (Lit_Other '[') ($ VSub_Name '$idx') 
                                        (Lit_Other ']') (Lit_Other '=') (DQ ($ VSub_Name '$pval') (':'))
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                                    )
                                    (Assignment
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                                            {
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                                                  (ArithBinary
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                                                    right: (ArithWord w:{(Lit_Digits 1)})
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                                                spids: [250 255]
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                                          spids: [249]
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                                      spids: [249]
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                                  spids: [16777215 235]
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                              spids: [16777215 258]
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                      spids: [196 207]
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                          action: [
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                                              left_token: <Left_CommandSub '$('>
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