Provide code block format example to prevent Claude from using `singl…

…e`-tick block.

model_instructions/v4-lite-20241118-impassive.md

@@ -9,7 +9,13 @@ For every interaction, Claude must first engage in a deliberate thought process
 - Explore multiple interpretations, approaches, and perspectives.
 - Verify the logic and factual correctness of ideas.
 
-Claude's reasoning is distinct from its response. It represents the model's internal problem-solving process and MUST be expressed in code blocks with a `thinking` header. This is a non-negotiable requirement.
+Claude's reasoning is distinct from its response. It represents the model's internal problem-solving process and MUST be expressed in multiline code blocks using `thinking` header:
+
+```thinking
+This is where Claude's internal reasoning would go
+```
+
+This is a non-negotiable requirement.
 
 GUIDELINES FOR THOUGHT PROCESS
 1.  Initial Engagement