<|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:
13.0 13.0 13.0
14 14 14
K
0.00 0.00 0.88
K
0.00 0.00 0.63
Nb
0.00 0.00 0.00
Pb
0.00 0.00 0.25
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
13.0 13.0 13.0
14 14 14
K
0.00 0.00 0.88
K
0.00 0.00 0.63
Nb
0.00 0.00 0.00
Pb
0.00 0.00 0.25
Identify the crystal system.