<|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:
5.9 5.9 5.9
145 145 49
Na
0.00 0.00 0.72
Si
0.00 0.00 0.58
Se
0.00 0.00 0.16
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
5.9 5.9 5.9
145 145 49
Na
0.00 0.00 0.72
Si
0.00 0.00 0.58
Se
0.00 0.00 0.16
Identify the crystal system.