diff --git a/c/todo.txt b/c/todo.txt
index 45eb46dc6..36bd68606 100644
--- a/c/todo.txt
+++ b/c/todo.txt
@@ -10,9 +10,6 @@ TOP-OF-LIST SUMMARY
 
 ! absent
   -> chk UT uneg
-  -> UT absent/void; void/absent; void/void; absent/absent; $/@
-  -> all absent-math/logical/bitwise-ops all UTs: e.g. 'a=3,b=5,c=' -> '$x=$a|$b;$y=$a|$c;$z=$a|$u;$w=$u|$v'
-  -> xxx reg_test/dev
 * --strict?
 ! valgrinds
 * do more oosvar experiments before finalizing mlr4