<|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:
3.5 3.5 8.0
90 90 90
Ca
0.00 0.00 0.81
Hf
0.73 0.73 0.51
Ta
0.00 0.00 0.17
Ta
0.73 0.73 0.47
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
3.5 3.5 8.0
90 90 90
Ca
0.00 0.00 0.81
Hf
0.73 0.73 0.51
Ta
0.00 0.00 0.17
Ta
0.73 0.73 0.47
Identify the crystal system.