<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Develop a program that prints out the output of the following expression.
[2, 4, 6, 8]<|im_end|>
<|im_start|>assistant
def expression_output(lst):
    s = 0
    for i in lst:
        s += i**2 - 5*i + 6
    return s<|im_end|>
