<|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:
4.0 4.0 4.0
90 90 90
Er
0.00 0.00 0.00
W
0.98 0.98 0.98
O
0.98 0.00 0.98
O
0.00 0.98 0.98
O
0.98 0.98 0.00
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
4.0 4.0 4.0
90 90 90
Er
0.00 0.00 0.00
W
0.98 0.98 0.98
O
0.98 0.00 0.98
O
0.00 0.98 0.98
O
0.98 0.98 0.00
Identify the crystal system.