<|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:
5.0 5.0 5.0
121 121 87
Be
0.00 0.00 0.00
Hg
0.44 0.00 0.81
Hg
0.00 0.00 0.62
Se
0.00 0.44 0.81
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
5.0 5.0 5.0
121 121 87
Be
0.00 0.00 0.00
Hg
0.44 0.00 0.81
Hg
0.00 0.00 0.62
Se
0.00 0.44 0.81
Identify the crystal system.