Find the units digit of $16^{17} \times 17^{18} \times 18^{19}$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Find the units digit of $16^{17} \times 17^{18} \times 18^{19}$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
8
Find the units digit of $16^{17} \times 17^{18} \times 18^{19}$.
train