<|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:
4.9 4.9 4.9
131 131 71
Ca
0.00 0.00 0.00
Cu
0.04 0.00 0.99
Cu
0.00 0.04 0.99
Pt
0.00 0.00 0.99
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
4.9 4.9 4.9
131 131 71
Ca
0.00 0.00 0.00
Cu
0.04 0.00 0.99
Cu
0.00 0.04 0.99
Pt
0.00 0.00 0.99
Identify the crystal system.