Define \[f(x) = (x-1)(x-3)(x-7)(x-9).\]Evaluate $f(6) - f(4)$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Define \[f(x) = (x-1)(x-3)(x-7)(x-9).\]Evaluate $f(6) - f(4)$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
0
Define \[f(x) = (x-1)(x-3)(x-7)(x-9).\]Evaluate $f(6) - f(4)$.
train