<|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:
5.7 5.7 5.7
135 135 64
Y
0.00 0.00 0.00
Zr
0.00 0.00 0.81
Nb
0.00 0.13 0.40
Nb
0.13 0.00 0.40
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
5.7 5.7 5.7
135 135 64
Y
0.00 0.00 0.00
Zr
0.00 0.00 0.81
Nb
0.00 0.13 0.40
Nb
0.13 0.00 0.40
Identify the crystal system.