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 ```
 
+### Cleaning functions
+
+To remove a function from a group, we need to ensure that this function returned
+0 for the last execution.
+
+```sh
+state_function_to_remove() {
+    # old code
+    # not used anymore
+    :
+}
+```
+
+This would prevent for seeing potential past errors caused by this function in
+the summary output.
+
 ### Using the r7 install functions
 
 The group library comes with the following functions that will allow