
import re

from filelock import FileLock


try:
							import nltk

							lowerCamelCase__           =	True
except (ImportError, ModuleNotFoundError):
							lowerCamelCase__           =	False

if NLTK_AVAILABLE:
							with FileLock(""".lock""") as lock:
														nltk.download("""punkt""", quiet=True)
def 					__lowerCAmelCase       (_UpperCamelCase	):
	re.sub('<n>' ,						'' ,						_UpperCamelCase	)  # remove pegasus newline char
	assert NLTK_AVAILABLE, "nltk must be installed to separate newlines between sentences. (pip install nltk)"
	return "\n".join(nltk.sent_tokenize(_UpperCamelCase	)	)

"""simple docstring"""







def 					__lowerCAmelCase       (_UpperCamelCase ,						_UpperCamelCase ,						_UpperCamelCase	):
	__lowerCAmelCase    :		List[str]		    =   len(_UpperCamelCase	)
	__lowerCAmelCase    :		Tuple		    =   [[0] * n for i in range(_UpperCamelCase	)]
	for i in range(_UpperCamelCase	):
		__lowerCAmelCase    :		Any		    =   y_points[i]

	for i in range(2 ,						_UpperCamelCase	):
		for j in range(_UpperCamelCase ,						_UpperCamelCase	):
			__lowerCAmelCase    :		int		    =   (
			    (xa - x_points[j - i + 1]) * q[j][i - 1]
			    - (xa - x_points[j]) * q[j - 1][i - 1]
			) / (x_points[j] - x_points[j - i + 1])

	return [q[n - 1][n - 1], q]


if __name__ == "__main__":
							import doctest

							doctest.testmod()