<|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:
3.1 3.1 7.5
90 90 120
Bi
0.55 0.00 0.80
B
0.55 0.00 0.18
B
0.00 0.00 0.64
Os
0.00 0.00 0.16
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
3.1 3.1 7.5
90 90 120
Bi
0.55 0.00 0.80
B
0.55 0.00 0.18
B
0.00 0.00 0.64
Os
0.00 0.00 0.16
Identify the crystal system.