(command.Pipeline
  children: [
    (command.Simple
      blame_tok: <tr>
      more_env: []
      words: [{<tr>} {<-cd>} {(SQ <'[.\\n0-9]'>)}]
      redirects: []
      do_fork: T
    )
    (command.Simple
      blame_tok: <sed>
      more_env: []
      words: [{<sed>} {(SQ <'/^$/d'>)}]
      redirects: []
      do_fork: T
    )
    (command.Simple
      blame_tok: <paste>
      more_env: []
      words: [{<paste>} {<-s>} {<-d> <Id.Lit_Other '+'>}]
      redirects: []
      do_fork: T
    )
    (command.Simple blame_tok:<bc> more_env:[] words:[{<bc>}] redirects:[] do_fork:T)
  ]
  ops: [<Id.Op_Pipe _> <Id.Op_Pipe _> <Id.Op_Pipe _>]
)