<|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:
6.0 6.0 6.0
135 131 68
Li
0.00 0.00 0.34
Sn
0.00 0.47 0.10
Pb
0.00 0.47 0.87
Pb
0.00 0.00 0.50
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
6.0 6.0 6.0
135 131 68
Li
0.00 0.00 0.34
Sn
0.00 0.47 0.10
Pb
0.00 0.47 0.87
Pb
0.00 0.00 0.50
Identify the crystal system.