<|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:
5.1 5.1 2.5
99 99 115
Na
0.00 0.00 0.00
Cr
0.98 0.83 0.19
Cr
0.98 0.17 0.19
Re
0.75 0.00 0.00
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
5.1 5.1 2.5
99 99 115
Na
0.00 0.00 0.00
Cr
0.98 0.83 0.19
Cr
0.98 0.17 0.19
Re
0.75 0.00 0.00
Identify the crystal system.