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                                    (BracedVarSub
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                      spids: [16777215 307]
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                  spids: [16777215 320]
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              fd: 16777215
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              spids: [335]
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      negated: F
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        (if_arm
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          action: [
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                                        spids: [493 500]
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                          (C {(tail)} {(-1)})
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                        negated: F
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                left_token: <Left_CommandSub '$('>
                spids: [383 510]
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          action: [
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                        spids: [561 577]
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