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This script was used to do the modification:
```
from pathlib import Path
import re
RE_LINE = r"/\*={50,150}\*/\n"
RE_MIDDLE = r"/\*.*\*/\n"
NEW_TEXT = """/*=======================================================================================*/
/* This Sail RISC-V architecture model, comprising all files and */
/* directories except where otherwise noted is subject the BSD */
/* two-clause license in the LICENSE file. */
/* */
/* SPDX-License-Identifier: BSD-2-Clause */
/*=======================================================================================*/
"""
REPLACEMENT = re.compile(rf"^{RE_LINE}(?:{RE_MIDDLE}){{10,100}}{RE_LINE}")
def main():
for file in Path("model").glob("**/*.sail"):
text = file.read_text(encoding="utf-8")
text = REPLACEMENT.sub(NEW_TEXT, text, 1)
file.write_text(text, encoding="utf-8")
if __name__ == "__main__":
main()
```
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