data_BC
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.57
_cell_length_b   7.57
_cell_length_c   7.57
_cell_angle_alpha   162.03
_cell_angle_beta   162.03
_cell_angle_gamma   25.52
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BC
_chemical_formula_sum   'B2 C2'
_cell_volume   41.24
_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
  B  B0  1  0.0  0.18  0.69  1.0
  B  B1  1  0.0  0.0  0.0  1.0
  C  C2  1  0.18  0.0  0.69  1.0
  C  C3  1  0.0  0.0  0.38  1.0

data_BC
_symmetry_space_group_name_H-M   P1
_cell_length_a   2.36
_cell_length_b   2.36
_cell_length_c   7.57
_cell_angle_alpha   98.98
_cell_angle_beta   98.98
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BC
_chemical_formula_sum   'B2 C2'
_cell_volume   41.24
_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
  B  B0  1  0.0  0.0  0.0  1.0
  B  B1  1  0.49  0.18  0.49  1.0
  C  C2  1  0.31  0.0  0.49  1.0
  C  C3  1  0.62  0.0  0.62  1.0

B B C C
B B C C 0 2 o o o 0 3 o o o 1 1 + o + 1 1 o + + 2 3 o o o 