<|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:
3.9 3.9 7.5
90 90 90
Y
0.94 0.94 0.33
Tl
0.94 0.94 0.13
Tl
0.00 0.00 0.97
P
0.00 0.00 0.78
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
3.9 3.9 7.5
90 90 90
Y
0.94 0.94 0.33
Tl
0.94 0.94 0.13
Tl
0.00 0.00 0.97
P
0.00 0.00 0.78
Identify the crystal system.