<|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 4.9 6.6
90 104 90
Mn
0.45 0.00 0.28
Tl
0.04 0.00 0.05
Tl
0.79 0.44 0.67
Pb
0.20 0.44 0.52
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
3.5 4.9 6.6
90 104 90
Mn
0.45 0.00 0.28
Tl
0.04 0.00 0.05
Tl
0.79 0.44 0.67
Pb
0.20 0.44 0.52
Identify the crystal system.