<|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:
7.1 7.1 7.1
39 39 39
Ca
0.00 0.00 0.69
Ca
0.00 0.00 0.09
Ag
0.00 0.00 0.00
Ag
0.00 0.00 0.07
Ag
0.00 0.00 0.72
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
7.1 7.1 7.1
39 39 39
Ca
0.00 0.00 0.69
Ca
0.00 0.00 0.09
Ag
0.00 0.00 0.00
Ag
0.00 0.00 0.07
Ag
0.00 0.00 0.72
Identify the crystal system.