<|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:
3.1 5.5 5.5
90 91 90
Nb
0.25 0.00 0.35
Tl
0.11 0.76 0.10
Tl
0.75 0.00 0.06
Hg
0.53 0.76 0.71
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
3.1 5.5 5.5
90 91 90
Nb
0.25 0.00 0.35
Tl
0.11 0.76 0.10
Tl
0.75 0.00 0.06
Hg
0.53 0.76 0.71
Identify the crystal system.