<|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:
2.6 2.6 6.9
90 90 90
Al
0.00 0.00 0.00
Cr
0.00 0.00 0.45
Ni
0.30 0.30 0.18
Ni
0.30 0.30 0.71
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
2.6 2.6 6.9
90 90 90
Al
0.00 0.00 0.00
Cr
0.00 0.00 0.45
Ni
0.30 0.30 0.18
Ni
0.30 0.30 0.71
Identify the crystal system.