<|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:
6.6 6.6 6.6
154 154 35
Tc
0.00 0.00 0.50
Hg
0.00 0.00 0.03
Pt
0.00 0.00 0.99
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
6.6 6.6 6.6
154 154 35
Tc
0.00 0.00 0.50
Hg
0.00 0.00 0.03
Pt
0.00 0.00 0.99
Identify the crystal system.