diff --git a/sandbox/typing.py b/sandbox/typing.py
new file mode 100644
index 0000000..5abed5d
--- /dev/null
+++ b/sandbox/typing.py
@@ -0,0 +1,7 @@
+#%%
+from giskard.match import GraphMatchSolver
+import numpy as np
+
+A = np.array([[1, 2], [3, 4]])
+B = np.zeros((3, 3))
+solver = GraphMatchSolver([A, B], A)