<|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:
5.4 5.4 2.6
90 90 120
Ca
0.00 0.00 0.00
Cu
0.70 0.00 0.00
Tc
0.35 0.65 0.28
Tc
0.35 0.35 0.28
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
5.4 5.4 2.6
90 90 120
Ca
0.00 0.00 0.00
Cu
0.70 0.00 0.00
Tc
0.35 0.65 0.28
Tc
0.35 0.35 0.28
Identify the crystal system.