The material described by Li4Ti3Nb2Co3O16 is Hausmannite-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(13), one O(14), one O(2), and one O(8) atom to form LiO4 tetrahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra, and corners with three equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-66°. In the second Li site, Li(2) is bonded in a rectangular see-saw-like geometry to one O(15), one O(16), one O(4), and one O(5) atom. In the third Li site, Li(3) is bonded to one O(10), one O(3), one O(6), and one O(9) atom to form LiO4 tetrahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, corners with three equivalent Nb(1)O6 octahedra,  an edgeedge with one Ti(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-64°. In the fourth Li site, Li(4) is bonded to one O(1), one O(11), one O(12), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, and corners with three equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-68°. There are three inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(10), one O(13), one O(14), one O(4), one O(7), and one O(9) atom to form TiO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra,  a cornercorner with one Li(4)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra,  an edgeedge with one Nb(2)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, edges with two equivalent Co(3)O6 octahedra, and  an edgeedge with one Li(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the second Ti site, Ti(2) is bonded to one O(1), one O(11), one O(15), one O(2), one O(3), and one O(5) atom to form TiO6 octahedra that share corners with two equivalent Nb(2)O6 octahedra,  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra,  an edgeedge with one Nb(1)O6 octahedra, edges with two equivalent Ti(3)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. In the third Ti site, Ti(3) is bonded to one O(1), one O(12), one O(16), one O(2), one O(3), and one O(5) atom to form TiO6 octahedra that share corners with two equivalent Nb(2)O6 octahedra,  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra,  an edgeedge with one Nb(1)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(10), one O(11), one O(12), one O(6), and one O(9) atom to form distorted NbO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra, corners with three equivalent Li(3)O4 tetrahedra, corners with three equivalent Li(4)O4 tetrahedra,  an edgeedge with one Ti(2)O6 octahedra,  an edgeedge with one Ti(3)O6 octahedra, and  an edgeedge with one Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-53°. In the second Nb site, Nb(2) is bonded to one O(13), one O(14), one O(15), one O(16), one O(5), and one O(8) atom to form distorted NbO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, corners with three equivalent Li(1)O4 tetrahedra,  an edgeedge with one Ti(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-54°. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(11), one O(12), one O(15), one O(16), one O(2), and one O(3) atom to form CoO6 octahedra that share corners with two equivalent Nb(2)O6 octahedra,  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra,  an edgeedge with one Nb(1)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and edges with two equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles are 47°. In the second Co site, Co(2) is bonded to one O(13), one O(4), one O(6), one O(7), one O(8), and one O(9) atom to form CoO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra,  a cornercorner with one Li(4)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra,  an edgeedge with one Nb(2)O6 octahedra, edges with two equivalent Ti(1)O6 octahedra, edges with two equivalent Co(3)O6 octahedra, and  an edgeedge with one Li(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-53°. In the third Co site, Co(3) is bonded to one O(10), one O(14), one O(4), one O(6), one O(7), and one O(8) atom to form CoO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra,  a cornercorner with one Li(4)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra,  an edgeedge with one Nb(2)O6 octahedra, edges with two equivalent Ti(1)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and  an edgeedge with one Li(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-53°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Li(4), one Ti(2), one Ti(3), and one Nb(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Li(1), one Ti(2), one Ti(3), and one Co(1) atom. In the third O site, O(3) is bonded to one Li(3), one Ti(2), one Ti(3), and one Co(1) atom to form corner-sharing OLiTi2Co tetrahedra. In the fourth O site, O(4) is bonded to one Li(2), one Ti(1), one Co(2), and one Co(3) atom to form corner-sharing OLiTiCo2 tetrahedra. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Li(2), one Ti(2), one Ti(3), and one Nb(2) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Li(3), one Nb(1), one Co(2), and one Co(3) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Li(4), one Ti(1), one Co(2), and one Co(3) atom. In the eighth O site, O(8) is bonded to one Li(1), one Nb(2), one Co(2), and one Co(3) atom to form distorted corner-sharing OLiNbCo2 tetrahedra. In the ninth O site, O(9) is bonded in a rectangular see-saw-like geometry to one Li(3), one Ti(1), one Nb(1), and one Co(2) atom. In the tenth O site, O(10) is bonded in a rectangular see-saw-like geometry to one Li(3), one Ti(1), one Nb(1), and one Co(3) atom. In the eleventh O site, O(11) is bonded to one Li(4), one Ti(2), one Nb(1), and one Co(1) atom to form distorted OLiTiNbCo tetrahedra that share  a cornercorner with one O(12)LiTiNbCo tetrahedra, corners with two equivalent O(3)LiTi2Co tetrahedra, and  an edgeedge with one O(12)LiTiNbCo tetrahedra. In the twelfth O site, O(12) is bonded to one Li(4), one Ti(3), one Nb(1), and one Co(1) atom to form distorted OLiTiNbCo tetrahedra that share  a cornercorner with one O(11)LiTiNbCo tetrahedra, corners with two equivalent O(3)LiTi2Co tetrahedra, and  an edgeedge with one O(11)LiTiNbCo tetrahedra. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Ti(1), one Nb(2), and one Co(2) atom. In the fourteenth O site, O(14) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Ti(1), one Nb(2), and one Co(3) atom. In the fifteenth O site, O(15) is bonded in a rectangular see-saw-like geometry to one Li(2), one Ti(2), one Nb(2), and one Co(1) atom. In the sixteenth O site, O(16) is bonded in a rectangular see-saw-like geometry to one Li(2), one Ti(3), one Nb(2), and one Co(1) atom. is represented by the CIF card [CIF]
data_Li4Ti3Nb2Co3O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.971
_cell_length_b   6.013
_cell_length_c   9.848
_cell_angle_alpha   90.335
_cell_angle_beta   90.007
_cell_angle_gamma   60.252
_symmetry_Int_Tables_number   1
_cell_volume   306.962
_cell_formula_units_Z   1
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
  Co  Co0  1  0.830  0.339  0.791  1.0
  Co  Co1  1  0.168  0.173  0.291  1.0
  Co  Co2  1  0.658  0.172  0.291  1.0
  Li  Li3  1  0.666  0.670  0.096  1.0
  Li  Li4  1  0.000  0.002  0.014  1.0
  Li  Li5  1  0.001  0.996  0.505  1.0
  Li  Li6  1  0.333  0.334  0.593  1.0
  Nb  Nb7  1  0.667  0.666  0.500  1.0
  Nb  Nb8  1  0.352  0.298  0.012  1.0
  O  O9  1  0.518  0.962  0.667  1.0
  O  O10  1  0.652  0.695  0.893  1.0
  O  O11  1  0.006  0.988  0.695  1.0
  O  O12  1  0.006  0.988  0.202  1.0
  O  O13  1  0.163  0.673  0.897  1.0
  O  O14  1  0.832  0.335  0.420  1.0
  O  O15  1  0.320  0.361  0.391  1.0
  O  O16  1  0.481  0.039  0.147  1.0
  O  O17  1  0.341  0.824  0.411  1.0
  O  O18  1  0.835  0.823  0.411  1.0
  O  O19  1  0.503  0.532  0.662  1.0
  O  O20  1  0.964  0.533  0.662  1.0
  O  O21  1  0.032  0.500  0.151  1.0
  O  O22  1  0.467  0.503  0.150  1.0
  O  O23  1  0.169  0.165  0.907  1.0
  O  O24  1  0.667  0.164  0.907  1.0
  Ti  Ti25  1  0.178  0.644  0.266  1.0
  Ti  Ti26  1  0.346  0.811  0.779  1.0
  Ti  Ti27  1  0.844  0.810  0.780  1.0
[/CIF]
.
The material described by Li4Ti3Nb2Co3O16 is Hausmannite-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(13), one O(14), one O(2), and one O(8) atom to form LiO4 tetrahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra, and corners with three equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-66°. In the second Li site, Li(2) is bonded in a rectangular see-saw-like geometry to one O(15), one O(16), one O(4), and one O(5) atom. In the third Li site, Li(3) is bonded to one O(10), one O(3), one O(6), and one O(9) atom to form LiO4 tetrahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, corners with three equivalent Nb(1)O6 octahedra,  an edgeedge with one Ti(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-64°. In the fourth Li site, Li(4) is bonded to one O(1), one O(11), one O(12), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, and corners with three equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-68°. There are three inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(10), one O(13), one O(14), one O(4), one O(7), and one O(9) atom to form TiO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra,  a cornercorner with one Li(4)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra,  an edgeedge with one Nb(2)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, edges with two equivalent Co(3)O6 octahedra, and  an edgeedge with one Li(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the second Ti site, Ti(2) is bonded to one O(1), one O(11), one O(15), one O(2), one O(3), and one O(5) atom to form TiO6 octahedra that share corners with two equivalent Nb(2)O6 octahedra,  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra,  an edgeedge with one Nb(1)O6 octahedra, edges with two equivalent Ti(3)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. In the third Ti site, Ti(3) is bonded to one O(1), one O(12), one O(16), one O(2), one O(3), and one O(5) atom to form TiO6 octahedra that share corners with two equivalent Nb(2)O6 octahedra,  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra,  an edgeedge with one Nb(1)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(10), one O(11), one O(12), one O(6), and one O(9) atom to form distorted NbO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra, corners with three equivalent Li(3)O4 tetrahedra, corners with three equivalent Li(4)O4 tetrahedra,  an edgeedge with one Ti(2)O6 octahedra,  an edgeedge with one Ti(3)O6 octahedra, and  an edgeedge with one Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-53°. In the second Nb site, Nb(2) is bonded to one O(13), one O(14), one O(15), one O(16), one O(5), and one O(8) atom to form distorted NbO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, corners with three equivalent Li(1)O4 tetrahedra,  an edgeedge with one Ti(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-54°. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(11), one O(12), one O(15), one O(16), one O(2), and one O(3) atom to form CoO6 octahedra that share corners with two equivalent Nb(2)O6 octahedra,  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra,  an edgeedge with one Nb(1)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and edges with two equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles are 47°. In the second Co site, Co(2) is bonded to one O(13), one O(4), one O(6), one O(7), one O(8), and one O(9) atom to form CoO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra,  a cornercorner with one Li(4)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra,  an edgeedge with one Nb(2)O6 octahedra, edges with two equivalent Ti(1)O6 octahedra, edges with two equivalent Co(3)O6 octahedra, and  an edgeedge with one Li(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-53°. In the third Co site, Co(3) is bonded to one O(10), one O(14), one O(4), one O(6), one O(7), and one O(8) atom to form CoO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra,  a cornercorner with one Li(4)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra,  an edgeedge with one Nb(2)O6 octahedra, edges with two equivalent Ti(1)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and  an edgeedge with one Li(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-53°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Li(4), one Ti(2), one Ti(3), and one Nb(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Li(1), one Ti(2), one Ti(3), and one Co(1) atom. In the third O site, O(3) is bonded to one Li(3), one Ti(2), one Ti(3), and one Co(1) atom to form corner-sharing OLiTi2Co tetrahedra. In the fourth O site, O(4) is bonded to one Li(2), one Ti(1), one Co(2), and one Co(3) atom to form corner-sharing OLiTiCo2 tetrahedra. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Li(2), one Ti(2), one Ti(3), and one Nb(2) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Li(3), one Nb(1), one Co(2), and one Co(3) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Li(4), one Ti(1), one Co(2), and one Co(3) atom. In the eighth O site, O(8) is bonded to one Li(1), one Nb(2), one Co(2), and one Co(3) atom to form distorted corner-sharing OLiNbCo2 tetrahedra. In the ninth O site, O(9) is bonded in a rectangular see-saw-like geometry to one Li(3), one Ti(1), one Nb(1), and one Co(2) atom. In the tenth O site, O(10) is bonded in a rectangular see-saw-like geometry to one Li(3), one Ti(1), one Nb(1), and one Co(3) atom. In the eleventh O site, O(11) is bonded to one Li(4), one Ti(2), one Nb(1), and one Co(1) atom to form distorted OLiTiNbCo tetrahedra that share  a cornercorner with one O(12)LiTiNbCo tetrahedra, corners with two equivalent O(3)LiTi2Co tetrahedra, and  an edgeedge with one O(12)LiTiNbCo tetrahedra. In the twelfth O site, O(12) is bonded to one Li(4), one Ti(3), one Nb(1), and one Co(1) atom to form distorted OLiTiNbCo tetrahedra that share  a cornercorner with one O(11)LiTiNbCo tetrahedra, corners with two equivalent O(3)LiTi2Co tetrahedra, and  an edgeedge with one O(11)LiTiNbCo tetrahedra. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Ti(1), one Nb(2), and one Co(2) atom. In the fourteenth O site, O(14) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Ti(1), one Nb(2), and one Co(3) atom. In the fifteenth O site, O(15) is bonded in a rectangular see-saw-like geometry to one Li(2), one Ti(2), one Nb(2), and one Co(1) atom. In the sixteenth O site, O(16) is bonded in a rectangular see-saw-like geometry to one Li(2), one Ti(3), one Nb(2), and one Co(1) atom. is represented by the CIF card [CIF]
data_Li4Ti3Nb2Co3O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.971
_cell_length_b   6.013
_cell_length_c   9.848
_cell_angle_alpha   90.335
_cell_angle_beta   90.007
_cell_angle_gamma   60.252
_symmetry_Int_Tables_number   1
_cell_volume   306.962
_cell_formula_units_Z   1
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
  Co  Co0  1  0.830  0.339  0.791  1.0
  Co  Co1  1  0.168  0.173  0.291  1.0
  Co  Co2  1  0.658  0.172  0.291  1.0
  Li  Li3  1  0.666  0.670  0.096  1.0
  Li  Li4  1  0.000  0.002  0.014  1.0
  Li  Li5  1  0.001  0.996  0.505  1.0
  Li  Li6  1  0.333  0.334  0.593  1.0
  Nb  Nb7  1  0.667  0.666  0.500  1.0
  Nb  Nb8  1  0.352  0.298  0.012  1.0
  O  O9  1  0.518  0.962  0.667  1.0
  O  O10  1  0.652  0.695  0.893  1.0
  O  O11  1  0.006  0.988  0.695  1.0
  O  O12  1  0.006  0.988  0.202  1.0
  O  O13  1  0.163  0.673  0.897  1.0
  O  O14  1  0.832  0.335  0.420  1.0
  O  O15  1  0.320  0.361  0.391  1.0
  O  O16  1  0.481  0.039  0.147  1.0
  O  O17  1  0.341  0.824  0.411  1.0
  O  O18  1  0.835  0.823  0.411  1.0
  O  O19  1  0.503  0.532  0.662  1.0
  O  O20  1  0.964  0.533  0.662  1.0
  O  O21  1  0.032  0.500  0.151  1.0
  O  O22  1  0.467  0.503  0.150  1.0
  O  O23  1  0.169  0.165  0.907  1.0
  O  O24  1  0.667  0.164  0.907  1.0
  Ti  Ti25  1  0.178  0.644  0.266  1.0
  Ti  Ti26  1  0.346  0.811  0.779  1.0
  Ti  Ti27  1  0.844  0.810  0.780  1.0
[/CIF]
.