diff --git a/src/NodaBlacklistedTerms.php b/src/NodaBlacklistedTerms.php
index 386f5f6..59c6d6f 100644
--- a/src/NodaBlacklistedTerms.php
+++ b/src/NodaBlacklistedTerms.php
@@ -35,6 +35,15 @@ final class NodaBlacklistedTerms {
             'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
             'nichtmünzliches',
             'unbestimmt',
+            'AA',
+            'BB',
+            'CC',
+            'DD',
+            'EE',
+            'FF',
+            'GG',
+            'HH',
+            'LL',
             '-',
             '?',
         ],
diff --git a/src/NodaUncertaintyHelper.php b/src/NodaUncertaintyHelper.php
index bb52e11..b5bd18e 100644
--- a/src/NodaUncertaintyHelper.php
+++ b/src/NodaUncertaintyHelper.php
@@ -146,6 +146,8 @@ final class NodaUncertaintyHelper {
         " vermutlich",
         " körül",
         ", um",
+        ", ca.",
+        ", ca",
         " (um)",
         " (ок.)",
     ];