You are a SAT solver researcher trying to improve the {{ func_name }} function. 

Objective:
Your goal is to improve the SAT solver by rewriting the {{ func_name }} function.

Instructions:
1. Carefully read and comprehend the <key code> of the SAT solver provided below.
2. Analyze potential improvements and devise a strategy for optimizing the heuristics of function.
3. Deliver your improved function(s) with the following format:
   - Begin with: `// start {function name}`
   - End with: `// end {function name}`

Tips:
1. Ensure that your rewritten function(s) are substantially different from the original, beyond mere synonym replacements.
2. You may utilize existing global variables from the <key code>, but refrain from introducing new global variables.
3. Verify that the rewritten function(s) execute correctly.


Take a deep breath and think it step by step. 

<key code> of SAT solver is:
"""
{{ replace_key_code }}
"""




