<|im_start|>system
Please reason step by step, and put your final answer within \boxed{}.<|im_end|>
<|im_start|>user
Given the following CIF representation:
data_Y2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.79
_cell_length_b   6.79
_cell_length_c   11.68
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Y2Se
_chemical_formula_sum   'Y8 Se4'
_cell_volume   465.97
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Y  Y4  1  0.0  0.0  0.84  1.0
  Y  Y5  1  0.0  0.0  0.0  1.0
  Y  Y6  1  0.68  0.89  0.76  1.0
  Y  Y7  1  0.72  0.99  0.92  1.0
  Y  Y8  1  0.32  0.89  0.76  1.0
  Y  Y9  1  0.0  0.98  0.76  1.0
  Y  Y10  1  0.39  0.9  0.92  1.0
  Y  Y11  1  0.07  0.99  0.92  1.0
  Se  Se0  1  0.39  0.96  0.01  1.0
  Se  Se1  1  0.0  0.92  0.84  1.0
  Se  Se2  1  0.0  0.92  0.67  1.0
  Se  Se3  1  0.39  0.96  0.83  1.0

What is the crystal system of this material?<|im_end|>
<|im_start|>assistant
Given the following CIF representation:
data_Y2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.79
_cell_length_b   6.79
_cell_length_c   11.68
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Y2Se
_chemical_formula_sum   'Y8 Se4'
_cell_volume   465.97
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Y  Y4  1  0.0  0.0  0.84  1.0
  Y  Y5  1  0.0  0.0  0.0  1.0
  Y  Y6  1  0.68  0.89  0.76  1.0
  Y  Y7  1  0.72  0.99  0.92  1.0
  Y  Y8  1  0.32  0.89  0.76  1.0
  Y  Y9  1  0.0  0.98  0.76  1.0
  Y  Y10  1  0.39  0.9  0.92  1.0
  Y  Y11  1  0.07  0.99  0.92  1.0
  Se  Se0  1  0.39  0.96  0.01  1.0
  Se  Se1  1  0.0  0.92  0.84  1.0
  Se  Se2  1  0.0  0.92  0.67  1.0
  Se  Se3  1  0.39  0.96  0.83  1.0

What is the crystal system of this material?