<|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:
4.8 4.6 5.1
90 105 90
Cu
0.63 0.00 0.71
Se
0.64 0.29 0.65
Br
0.75 0.00 0.75
Br
0.57 0.29 0.78
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
4.8 4.6 5.1
90 105 90
Cu
0.63 0.00 0.71
Se
0.64 0.29 0.65
Br
0.75 0.00 0.75
Br
0.57 0.29 0.78
Identify the crystal system.