diff --git a/b_asic/core_operations.py b/b_asic/core_operations.py
index 175c59d12c4ff4b49be18f995c9d8eb14c778149..55421296a60a890978a11e5fa3c66d11768d27a3 100644
--- a/b_asic/core_operations.py
+++ b/b_asic/core_operations.py
@@ -1677,6 +1677,7 @@ class DontCare(AbstractOperation):
             output_count=1,
             name=name,
             latency_offsets={"out0": 0},
+            execution_time=0,
         )
 
     @classmethod
@@ -1753,6 +1754,7 @@ class Sink(AbstractOperation):
             output_count=0,
             name=name,
             latency_offsets={"in0": 0},
+            execution_time=0,
         )
 
     @classmethod
@@ -1777,28 +1779,14 @@ class Sink(AbstractOperation):
     ) -> tuple[tuple[tuple[float, float], ...], tuple[tuple[float, float], ...]]:
         # Doc-string inherited
         return (
-            (
-                (-0.5, 0),
-                (-0.5, 1),
-                (-0.25, 1),
-                (0, 0.5),
-                (-0.25, 0),
-                (-0.5, 0),
-            ),
-            (
-                (-0.5, 0),
-                (-0.5, 1),
-                (-0.25, 1),
-                (0, 0.5),
-                (-0.25, 0),
-                (-0.5, 0),
-            ),
+            ((0, 0), (0, 1), (0.25, 1), (0.5, 0.5), (0.25, 0), (0, 0)),
+            ((0, 0), (0, 1), (0.25, 1), (0.5, 0.5), (0.25, 0), (0, 0)),
         )
 
     def get_input_coordinates(self) -> tuple[tuple[float, float], ...]:
         # doc-string inherited
-        return tuple()
+        return ((0, 0.5),)
 
     def get_output_coordinates(self) -> tuple[tuple[float, float], ...]:
         # doc-string inherited
-        return ((0, 0.5),)
+        return tuple()
diff --git a/examples/ldlt_matrix_inverse.py b/examples/ldlt_matrix_inverse.py
index 3921afe4a17d07626d4850496009023e494f9d36..845bd14b807de68a5313d36db805483f42897fbe 100644
--- a/examples/ldlt_matrix_inverse.py
+++ b/examples/ldlt_matrix_inverse.py
@@ -27,10 +27,8 @@ sfg
 
 # %%
 # Set latencies and execution times.
-sfg.set_latency_of_type(DontCare.type_name(), 0)  # REMOVE!!!
 sfg.set_latency_of_type(MADS.type_name(), 3)
 sfg.set_latency_of_type(Reciprocal.type_name(), 2)
-sfg.set_execution_time_of_type(DontCare.type_name(), 0)  # REMOVE!!!
 sfg.set_execution_time_of_type(MADS.type_name(), 1)
 sfg.set_execution_time_of_type(Reciprocal.type_name(), 1)