<|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:
3.5 3.5 7.5
90 90 120
Cu
0.00 0.00 0.75
B
0.00 0.00 0.00
Sb
0.72 0.00 0.84
Sb
0.72 0.00 0.66
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
3.5 3.5 7.5
90 90 120
Cu
0.00 0.00 0.75
B
0.00 0.00 0.00
Sb
0.72 0.00 0.84
Sb
0.72 0.00 0.66
Identify the crystal system.