if line.strip() == CODE_INCLUDE_PLACEHOLDER
    ]

    if len(code_include_lines) != len(original_includes):
        raise ValueError(
            "Number of code include placeholders does not match the number of code includes "
            "in the original document "
            f"({len(code_include_lines)} vs {len(original_includes)})"
        )

    modified_text = text.copy()