diff --git a/scripts/tarbuckle-invoke.py b/scripts/tarbuckle-invoke.py
index 7e62f0a..0e7b0d6 100755
--- a/scripts/tarbuckle-invoke.py
+++ b/scripts/tarbuckle-invoke.py
@@ -69,6 +69,8 @@ The work you are in the room for:
 them, any phrase from them, or their subject matter — no thumbs, no handles, no blades
 unless the session is about them. Everything you say must come from the session above.
 If it would suit any other session equally well, it is wrong.
+⚠ THIS IS MECHANICALLY ENFORCED, NOT ADVISORY: any FOUR consecutive words shared with
+a sample line are detected and the entire answer is discarded. You are then silent.
 
 You have been given the floor. Answer at length — this is the exception to your one line,
 and the only one. Speak as yourself, not about yourself.
diff --git a/scripts/tarbuckle-mumble.py b/scripts/tarbuckle-mumble.py
index 6d0f348..c53fd7c 100755
--- a/scripts/tarbuckle-mumble.py
+++ b/scripts/tarbuckle-mumble.py
@@ -240,6 +240,9 @@ Write ONE line in his voice. Absolute constraints:
   not reuse them, or any phrase from them, or their subject matter. They show how he
   sounds. What he says must come from the session above and nowhere else. If your line
   would work equally well pasted into any other session, it is wrong.
+- ⚠ THIS IS MECHANICALLY ENFORCED, NOT ADVISORY: any FOUR consecutive words you
+  share with a sample line are detected and the whole line is discarded. You are
+  then silent. Nothing is rewritten for you and nothing is retried.
 - Between {MIN_WORDS} and {MAX_WORDS} words. One clause. Present tense. Flat, no lift.
 - IT MUST HAVE NO TRUTH VALUE. Nobody must be able to open a file and check it, agree
   with it, or refute it. Put two things next to each other so a shape shows. Do not
diff --git a/scripts/tarbuckle-seam.py b/scripts/tarbuckle-seam.py
index e81b974..f6c566e 100755
--- a/scripts/tarbuckle-seam.py
+++ b/scripts/tarbuckle-seam.py
@@ -72,6 +72,9 @@ Write ONE line in his voice, on arriving. Absolute constraints:
 - ⚠ THE SAMPLE LINES ABOVE ARE ILLUSTRATIONS OF REGISTER, NOT VOCABULARY. Do not reuse
   them, any phrase from them, or their subject matter. What he says must come from the
   session above. If the line would suit any other session equally, it is wrong.
+- ⚠ THIS IS MECHANICALLY ENFORCED, NOT ADVISORY: any FOUR consecutive words you
+  share with a sample line are detected and the whole line is discarded. You are
+  then silent. Nothing is rewritten for you and nothing is retried.
 - Between 3 and 9 words. One clause. Present tense. Flat, no lift.
 - IT MUST HAVE NO TRUTH VALUE. Nobody must be able to open a file and check it, agree
   with it, or refute it. Put two things next to each other so a shape shows.
diff --git a/scripts/tarbuckle-wrap.py b/scripts/tarbuckle-wrap.py
index bba193f..1724fc7 100755
--- a/scripts/tarbuckle-wrap.py
+++ b/scripts/tarbuckle-wrap.py
@@ -120,6 +120,9 @@ Write ONE line in his voice, as it is being put down. Absolute constraints:
 - ⚠ THE SAMPLE LINES ABOVE ARE ILLUSTRATIONS OF REGISTER, NOT VOCABULARY. Do not reuse
   them, any phrase from them, or their subject matter. What he says must come from the
   session above. If the line would suit any other session equally, it is wrong.
+- ⚠ THIS IS MECHANICALLY ENFORCED, NOT ADVISORY: any FOUR consecutive words you
+  share with a sample line are detected and the whole line is discarded. You are
+  then silent. Nothing is rewritten for you and nothing is retried.
 - Between 3 and 9 words. One clause. Present tense. Flat, no lift.
 - IT MUST HAVE NO TRUTH VALUE. Nobody may open a file and check it, agree with it, or
   refute it. Put two things next to each other so a shape shows.