<|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:
4.4 4.4 4.4
90 90 90
Be
0.20 0.00 0.20
Be
0.20 0.20 0.00
Be
0.00 0.20 0.20
Nb
0.00 0.00 0.00
Sn
0.20 0.20 0.20
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
4.4 4.4 4.4
90 90 90
Be
0.20 0.00 0.20
Be
0.20 0.20 0.00
Be
0.00 0.20 0.20
Nb
0.00 0.00 0.00
Sn
0.20 0.20 0.20
Identify the crystal system.