(CommandList
  children: [
    (Pipeline
      children: [
        (C {(tr)} {(-cd)} {(SQ <"[.\\n0-9]">)})
        (C {(sed)} {(SQ <"/^$/d">)})
        (C {(paste)} {(-s)} {(-d) (Lit_Other "+")})
        (C {(bc)})
      ]
      negated: False
    )
  ]
)