(command.CommandList
  children: [
    (command.AndOr
      ops: [Id.Op_DPipe]
      children: [(C {<cd>} {<'/usr'>}) (command.ControlFlow token:<Id.ControlFlow_Exit exit>)]
    )
    (command.Pipeline
      children: [
        (BraceGroup
          children: [(C {<find>} {<include>} {<'src/'> <Id.Lit_Star '*'>} {<-type>} {<f>})]
        )
        (BraceGroup children:[(C {<sort>})])
        (BraceGroup
          children: [
            (C {<sed>} {<-e>} 
              {
                (SQ <'/\\.o$/d\n'> <'\t\t/\\.a$/d\n'> <'\t\t/\\.bak$/d\n'> <'\t\t/\\/a\\.out$/d\n'> 
                  <'\t\t/\\/core$/d\n'> <'\t\t/\\/bin\\/[^/]*$/d'>
                )
              }
            )
          ]
        )
        (BraceGroup children:[(C {<xargs>} {<crc>})])
      ]
      negated: F
    )
  ]
)