<|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
31 31 31
Ti
0.00 0.00 0.99
Ti
0.00 0.00 0.72
Cu
0.00 0.00 0.00
Se
0.00 0.00 0.36
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
6.6 6.6 6.6
31 31 31
Ti
0.00 0.00 0.99
Ti
0.00 0.00 0.72
Cu
0.00 0.00 0.00
Se
0.00 0.00 0.36
Identify the crystal system.