<|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:
5.2 5.2 5.2
143 121 71
Cr
0.00 0.00 0.00
Si
0.00 0.57 0.42
Si
0.63 0.00 0.84
Bi
0.00 0.00 0.25
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
5.2 5.2 5.2
143 121 71
Cr
0.00 0.00 0.00
Si
0.00 0.57 0.42
Si
0.63 0.00 0.84
Bi
0.00 0.00 0.25
Identify the crystal system.