I am done

rl/Lib/site-packages/matplotlib/tri/_triinterpolate.pyi

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+from matplotlib.tri import Triangulation, TriFinder
+
+from typing import Literal
+import numpy as np
+from numpy.typing import ArrayLike
+
+class TriInterpolator:
+    def __init__(
+        self,
+        triangulation: Triangulation,
+        z: ArrayLike,
+        trifinder: TriFinder | None = ...,
+    ) -> None: ...
+    # __call__ and gradient are not actually implemented by the ABC, but are specified as required
+    def __call__(self, x: ArrayLike, y: ArrayLike) -> np.ma.MaskedArray: ...
+    def gradient(
+        self, x: ArrayLike, y: ArrayLike
+    ) -> tuple[np.ma.MaskedArray, np.ma.MaskedArray]: ...
+
+class LinearTriInterpolator(TriInterpolator): ...
+
+class CubicTriInterpolator(TriInterpolator):
+    def __init__(
+        self,
+        triangulation: Triangulation,
+        z: ArrayLike,
+        kind: Literal["min_E", "geom", "user"] = ...,
+        trifinder: TriFinder | None = ...,
+        dz: tuple[ArrayLike, ArrayLike] | None = ...,
+    ) -> None: ...