(CommandList
  children: [
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:x) op:Equal rhs:{(1)} spids:[7])]
      spids: [7]
    )
    (C {(cd)} {(/)})
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:y) op:Equal rhs:{(2)} spids:[14])]
      spids: [14]
    )
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:z) op:Equal rhs:{(0)} spids:[17])]
      spids: [17]
    )
  ]
)