<|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:
8.8 8.8 8.8
18 18 18
Nb
0.00 0.00 0.03
Ga
0.00 0.00 0.64
Ga
0.00 0.00 0.43
Cu
0.00 0.00 0.00
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
8.8 8.8 8.8
18 18 18
Nb
0.00 0.00 0.03
Ga
0.00 0.00 0.64
Ga
0.00 0.00 0.43
Cu
0.00 0.00 0.00
Identify the crystal system.