<|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:
8.7 8.7 8.7
25 25 25
Li
0.00 0.00 0.00
Pb
0.00 0.00 0.17
Pb
0.00 0.00 0.90
Se
0.00 0.00 0.54
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
8.7 8.7 8.7
25 25 25
Li
0.00 0.00 0.00
Pb
0.00 0.00 0.17
Pb
0.00 0.00 0.90
Se
0.00 0.00 0.54
Identify the crystal system.