<|im_start|>system
Please reason step by step, and put your final answer within \boxed{}.<|im_end|>
<|im_start|>user
Given the following crystal representation:
3.0 4.2 6.7
90 90 90
Na
0.00 0.00 0.00
Hf
0.00 0.00 0.37
Al
0.50 0.11 0.99
Al
0.50 0.11 0.74
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
3.0 4.2 6.7
90 90 90
Na
0.00 0.00 0.00
Hf
0.00 0.00 0.37
Al
0.50 0.11 0.99
Al
0.50 0.11 0.74
Identify the crystal system.