<|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:
5.1 5.1 5.1
90 90 90
Nb
0.54 0.00 0.54
Nb
0.54 0.54 0.00
Nb
0.00 0.54 0.54
Tc
0.00 0.00 0.00
Pb
0.54 0.54 0.54
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
5.1 5.1 5.1
90 90 90
Nb
0.54 0.00 0.54
Nb
0.54 0.54 0.00
Nb
0.00 0.54 0.54
Tc
0.00 0.00 0.00
Pb
0.54 0.54 0.54
Identify the crystal system.