<|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:
3.6 4.2 6.0
90 90 90
Tl
0.00 0.00 0.69
Cr
0.00 0.00 0.88
Cr
0.79 0.10 0.63
Bi
0.79 0.10 0.79
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
3.6 4.2 6.0
90 90 90
Tl
0.00 0.00 0.69
Cr
0.00 0.00 0.88
Cr
0.79 0.10 0.63
Bi
0.79 0.10 0.79
Identify the crystal system.