<|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_P2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.15
_cell_length_b   6.15
_cell_length_c   8.26
_cell_angle_alpha   108.31
_cell_angle_beta   108.31
_cell_angle_gamma   29.77
_symmetry_Int_Tables_number   1
_chemical_formula_structural   P2Se
_chemical_formula_sum   'P4 Se2'
_cell_volume   146.63
_cell_formula_units_Z   2
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
  P  P0  1  0.25  0.0  0.01  1.0
  P  P1  1  0.06  0.0  0.32  1.0
  P  P2  1  0.95  0.0  0.8  1.0
  P  P3  1  0.14  0.0  0.49  1.0
  Se  Se4  1  0.07  0.0  0.49  1.0
  Se  Se5  1  0.13  0.0  0.32  1.0

What is the crystal system of this material?<|im_end|>
<|im_start|>assistant
Given the following CIF representation:
data_P2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.15
_cell_length_b   6.15
_cell_length_c   8.26
_cell_angle_alpha   108.31
_cell_angle_beta   108.31
_cell_angle_gamma   29.77
_symmetry_Int_Tables_number   1
_chemical_formula_structural   P2Se
_chemical_formula_sum   'P4 Se2'
_cell_volume   146.63
_cell_formula_units_Z   2
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
  P  P0  1  0.25  0.0  0.01  1.0
  P  P1  1  0.06  0.0  0.32  1.0
  P  P2  1  0.95  0.0  0.8  1.0
  P  P3  1  0.14  0.0  0.49  1.0
  Se  Se4  1  0.07  0.0  0.49  1.0
  Se  Se5  1  0.13  0.0  0.32  1.0

What is the crystal system of this material?