ProgramNode(0...15)(
  [],
  StatementsNode(0...15)(
    [CallNode(0...1)(nil, nil, (0...1), nil, nil, nil, nil, 0, "a"),
     CallNode(2...3)(nil, nil, (2...3), nil, nil, nil, nil, 0, "b"),
     CallNode(14...15)(nil, nil, (14...15), nil, nil, nil, nil, 0, "c")]
  )
)
