[Pw_forum] vc-relax - Convergence Problems
Andre Martinotto
almartinotto at gmail.com
Fri Aug 20 22:29:33 CEST 2010
Dear Stefano,
Do you have any suggestion to accelerating the convergence?
Andre Martinotto
Email: almartinotto at gmail.com
Computing Department
Universidade de Caxias do Sul
Caxias do Sul - RS, Brazil
On Fri, Aug 20, 2010 at 4:06 PM, Stefano de Gironcoli <degironc at sissa.it>wrote:
> so far so good... maybe it's only slow...
> I don't recall now exactly how BFGS works but the fact that at each stem
> it says
>
> enthalpy_new < enthalpy_old
>
> maybe means that it's going downhill without finding a minimum along the
> line search and the step is limited by the trust_radius.
> maybe you started very far from the minimum or there are rotations of
> some rigid units involved ...
>
> stefano
>
> Andre Martinotto wrote:
> > Yes, the enthalpy is decreasing the enthalpy is decreasing. Below the
> values
> > of the enthaply.
> >
> > Best regards,
> > André Luis Martinotto
> >
> > Andre Martinotto
> > Email: almartinotto at gmail.com
> > Computing Department
> > Universidade de Caxias do Sul
> > Caxias do Sul - RS, Brazil
> >
> > enthalpy old = -1018.4377035275 Ry
> > enthalpy new = -1018.4494900797 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4494900797 Ry
> > enthalpy new = -1018.4568547798 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4568547798 Ry
> > enthalpy new = -1018.4624673172 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4624673172 Ry
> > enthalpy new = -1018.4675637420 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4675637420 Ry
> > enthalpy new = -1018.4745374801 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4745374801 Ry
> > enthalpy new = -1018.4787658712 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4787658712 Ry
> > enthalpy new = -1018.4839453395 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4839453395 Ry
> > enthalpy new = -1018.4906317150 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4906317150 Ry
> > enthalpy new = -1018.4927767110 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4927767110 Ry
> > enthalpy new = -1018.4939707446 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4939707446 Ry
> > enthalpy new = -1018.4946012005 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4946012005 Ry
> > enthalpy new = -1018.4951369286 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4951369286 Ry
> > enthalpy new = -1018.4955690712 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4955690712 Ry
> > enthalpy new = -1018.4961210855 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4961210855 Ry
> > enthalpy new = -1018.4964627786 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4964627786 Ry
> > enthalpy new = -1018.4971749436 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4971749436 Ry
> > enthalpy new = -1018.4985789257 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4985789257 Ry
> > enthalpy new = -1018.4996031008 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.4996031008 Ry
> > enthalpy new = -1018.5008017865 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5008017865 Ry
> > enthalpy new = -1018.5036232518 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5036232518 Ry
> > enthalpy new = -1018.5070595112 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5070595112 Ry
> > enthalpy new = -1018.5117630729 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5117630729 Ry
> > enthalpy new = -1018.5170591719 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5170591719 Ry
> > enthalpy new = -1018.5222913399 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5222913399 Ry
> > enthalpy new = -1018.5282241124 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5282241124 Ry
> > enthalpy new = -1018.5342597827 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5342597827 Ry
> > enthalpy new = -1018.5406966898 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5406966898 Ry
> > enthalpy new = -1018.5469217329 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5469217329 Ry
> > enthalpy new = -1018.5530869862 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5530869862 Ry
> > enthalpy new = -1018.5599277199 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5599277199 Ry
> > enthalpy new = -1018.5668277117 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5668277117 Ry
> > enthalpy new = -1018.5740583719 Ry
> > CASE: enthalpy_new < enthalpy_old
> > enthalpy old = -1018.5740583719 Ry
> > enthalpy new = -1018.5816796313 Ry
> >
> > **
> > On Fri, Aug 20, 2010 at 2:53 PM, Stefano de Gironcoli <degironc at sissa.it
> >wrote:
> >
> >
> >> is the enthalpy decreasing during the relaxation ?
> >> stefano
> >>
> >> Andre Martinotto wrote:
> >>
> >>> Dear Stefano,
> >>>
> >>> Sorry. I sent the wrong input file. The outputs correspond to the file
> >>> below.
> >>>
> >>> Best regards,
> >>> André Luis Martinotto
> >>>
> >>> Andre Martinotto
> >>> Email: almartinotto at gmail.com
> >>> Computing Department
> >>> Universidade de Caxias do Sul
> >>> Caxias do Sul - RS, Brazil
> >>>
> >>> &CONTROL
> >>> title = CoSb3 ,
> >>> calculation = 'vc-relax',
> >>> restart_mode = 'restart',
> >>> wf_collect = .true. ,
> >>> outdir = '/dados/almartin/est2_a' ,
> >>> wfcdir = '/dados/almartin/est2_a' ,
> >>> pseudo_dir = '/home/u/almartin/cosb3/pseudo' ,
> >>> prefix = 'est1' ,
> >>> etot_conv_thr = 1.0D-4 ,
> >>> forc_conv_thr = 1.0D-3 ,
> >>> tstress = .true. ,
> >>> tprnfor = .true.
> >>> /
> >>> &SYSTEM
> >>> ibrav = 1,
> >>> A = 8.5012 ,
> >>> nat = 32,
> >>> ntyp = 2,
> >>> ecutwfc = 30. ,
> >>> ecutrho = 300 ,
> >>> input_dft = 'PBE' ,
> >>> occupations = 'smearing' ,
> >>> degauss = 0.01 ,
> >>> smearing = 'marzari-vanderbilt' ,
> >>> /
> >>> &ELECTRONS
> >>> conv_thr = 1.0D-9 ,
> >>> startingpot = 'atomic' ,
> >>> startingwfc = 'atomic' ,
> >>> mixing_mode = 'plain' ,
> >>> mixing_beta = 0.7D0 ,
> >>> diagonalization = 'david' ,
> >>> /
> >>> &IONS
> >>> ion_dynamics = 'bfgs' ,
> >>> ion_positions = 'default' ,
> >>> /
> >>> &CELL
> >>> cell_dynamics = 'bfgs' ,
> >>> press = 0.D0 ,
> >>> press_conv_thr = 0.2D0 ,
> >>> cell_factor = 1.5D0 ,
> >>> /
> >>> ATOMIC_SPECIES
> >>> Co 58.93300 Co.pbe-nd-rrkjus.UPF
> >>> Sb 121.76000 Sb.pbe-rrkjus.UPF
> >>> ATOMIC_POSITIONS crystal
> >>> Co 0.25 0.25 0.25 1 1 1
> >>> Co 0.75 0.75 0.25 1 1 1
> >>> Co 0.75 0.25 0.75 1 1 1
> >>> Co 0.25 0.75 0.75 1 1 1
> >>> Co 0.75 0.75 0.75 1 1 1
> >>> Co 0.25 0.25 0.75 1 1 1
> >>> Co 0.25 0.75 0.25 1 1 1
> >>> Co 0.75 0.25 0.25 1 1 1
> >>> Sb 0 0.6646 0.8421 1 1 1
> >>> Sb 0 0.3354 0.8421 1 1 1
> >>> Sb 0 0.6646 0.1579 1 1 1
> >>> Sb 0 0.3354 0.1579 1 1 1
> >>> Sb 0.8421 0 0.6646 1 1 1
> >>> Sb 0.6646 0.8421 0 1 1 1
> >>> Sb 0.8421 0 0.3354 1 1 1
> >>> Sb 0.3354 0.8421 0 1 1 1
> >>> Sb 0.1579 0 0.6646 1 1 1
> >>> Sb 0.6646 0.1579 0 1 1 1
> >>> Sb 0.1579 0 0.3354 1 1 1
> >>> Sb 0. 0. 0. 0 0 0
> >>> Sb 0.5 0.1646 0.3421 1 1 1
> >>> Sb 0.5 0.8354 0.3421 1 1 1
> >>> Sb 0.5 0.1646 0.6579 1 1 1
> >>> Sb 0.5 0.8354 0.6579 1 1 1
> >>> Sb 0.3421 0.5 0.1646 1 1 1
> >>> Sb 0.1646 0.3421 0.5 1 1 1
> >>> Sb 0.3421 0.5 0.8354 1 1 1
> >>> Sb 0.8354 0.3421 0.5 1 1 1
> >>> Sb 0.6579 0.5 0.1646 1 1 1
> >>> Sb 0.1646 0.6579 0.5 1 1 1
> >>> Sb 0.6579 0.5 0.8354 1 1 1
> >>> Sb 0.5 0.5 0.5 0 0 0
> >>> K_POINTS automatic
> >>> 8 8 8 0 0 0
> >>>
> >>>
> >>>
> >>> On Fri, Aug 20, 2010 at 12:17 PM, Stefano de Gironcoli <
> >>>
> >> degironc at sissa.it>wrote:
> >>
> >>>
> >>>> you ARE NOT making a vc-relaxation unless you specify
> >>>> calculation='vc-relax'
> >>>> stefano
> >>>>
> >>>> Andre Martinotto wrote:
> >>>>
> >>>>
> >>>>> Dear all,
> >>>>>
> >>>>> I'm trying to make a vc-relax optimization of a structure with
> >>>>>
> >> vacancies,
> >>
> >>>>> but I'm having some problems for convergence. I have a problem with
> >>>>>
> >>>>>
> >>>> forces
> >>>>
> >>>>
> >>>>> convergence. Below the input file as are the force and stress
> results.
> >>>>>
> >>>>> Someone would have some suggestion to solve this problem?
> >>>>>
> >>>>> Thanks!
> >>>>>
> >>>>> Best regards,
> >>>>> André Luis Martinotto
> >>>>>
> >>>>> Andre Martinotto
> >>>>> Email: almartinotto at gmail.com
> >>>>> Computing Department
> >>>>> Universidade de Caxias do Sul
> >>>>> Caxias do Sul - RS, Brazil
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> /------------------------------------- input file
> >>>>> ---------------------------------------/
> >>>>> &CONTROL
> >>>>> title = CoSb3 ,
> >>>>> calculation = 'relax',
> >>>>> restart_mode = 'restart',
> >>>>> wf_collect = .true. ,
> >>>>> outdir = '/dados/almartin/est2_a' ,
> >>>>> wfcdir = '/dados/almartin/est2_a' ,
> >>>>> pseudo_dir = '/home/u/almartin/cosb3/pseudo' ,
> >>>>> prefix = 'est1' ,
> >>>>> etot_conv_thr = 1.0D-4 ,
> >>>>> forc_conv_thr = 1.0D-3 ,
> >>>>> tstress = .true. ,
> >>>>> tprnfor = .true.
> >>>>> /
> >>>>> &SYSTEM
> >>>>> ibrav = 1,
> >>>>> A = 8.5012 ,
> >>>>> nat = 32,
> >>>>> ntyp = 2,
> >>>>> ecutwfc = 30. ,
> >>>>> ecutrho = 300 ,
> >>>>> input_dft = 'PBE' ,
> >>>>> occupations = 'smearing' ,
> >>>>> degauss = 0.01 ,
> >>>>> smearing = 'marzari-vanderbilt' ,
> >>>>> /
> >>>>> &ELECTRONS
> >>>>> conv_thr = 1.0D-9 ,
> >>>>> startingpot = 'atomic' ,
> >>>>> startingwfc = 'atomic' ,
> >>>>> mixing_mode = 'plain' ,
> >>>>> mixing_beta = 0.7D0 ,
> >>>>> diagonalization = 'david' ,
> >>>>> /
> >>>>> &IONS
> >>>>> ion_dynamics = 'bfgs' ,
> >>>>> ion_positions = 'default' ,
> >>>>> /
> >>>>> &CELL
> >>>>> cell_dynamics = 'bfgs' ,
> >>>>> press = 0.D0 ,
> >>>>> press_conv_thr = 0.2D0 ,
> >>>>> cell_factor = 1.5D0 ,
> >>>>> /
> >>>>> ATOMIC_SPECIES
> >>>>> Co 58.93300 Co.pbe-nd-rrkjus.UPF
> >>>>> Sb 121.76000 Sb.pbe-rrkjus.UPF
> >>>>> ATOMIC_POSITIONS crystal
> >>>>> Co 0.25 0.25 0.25 1 1 1
> >>>>> Co 0.75 0.75 0.25 1 1 1
> >>>>> Co 0.75 0.25 0.75 1 1 1
> >>>>> Co 0.25 0.75 0.75 1 1 1
> >>>>> Co 0.75 0.75 0.75 1 1 1
> >>>>> Co 0.25 0.25 0.75 1 1 1
> >>>>> Co 0.25 0.75 0.25 1 1 1
> >>>>> Co 0.75 0.25 0.25 1 1 1
> >>>>> Sb 0 0.6646 0.8421 1 1 1
> >>>>> Sb 0 0.3354 0.8421 1 1 1
> >>>>> Sb 0 0.6646 0.1579 1 1 1
> >>>>> Sb 0 0.3354 0.1579 1 1 1
> >>>>> Sb 0.8421 0 0.6646 1 1 1
> >>>>> Sb 0.6646 0.8421 0 1 1 1
> >>>>> Sb 0.8421 0 0.3354 1 1 1
> >>>>> Sb 0.3354 0.8421 0 1 1 1
> >>>>> Sb 0.1579 0 0.6646 1 1 1
> >>>>> Sb 0.6646 0.1579 0 1 1 1
> >>>>> Sb 0.1579 0 0.3354 1 1 1
> >>>>> Sb 0. 0. 0. 0 0 0
> >>>>> Sb 0.5 0.1646 0.3421 1 1 1
> >>>>> Sb 0.5 0.8354 0.3421 1 1 1
> >>>>> Sb 0.5 0.1646 0.6579 1 1 1
> >>>>> Sb 0.5 0.8354 0.6579 1 1 1
> >>>>> Sb 0.3421 0.5 0.1646 1 1 1
> >>>>> Sb 0.1646 0.3421 0.5 1 1 1
> >>>>> Sb 0.3421 0.5 0.8354 1 1 1
> >>>>> Sb 0.8354 0.3421 0.5 1 1 1
> >>>>> Sb 0.6579 0.5 0.1646 1 1 1
> >>>>> Sb 0.1646 0.6579 0.5 1 1 1
> >>>>> Sb 0.6579 0.5 0.8354 1 1 1
> >>>>> Sb 0.5 0.5 0.5 0 0 0
> >>>>> K_POINTS automatic
> >>>>> 8 8 8 0 0 0
> >>>>>
> >>>>> /------------------------------------- stress results
> >>>>> --------------------------------------/
> >>>>>
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 0.77
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 9.48
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 11.91
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 4.78
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> -6.89
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> -2.65
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 1.31
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 5.44
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 2.47
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> -2.82
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> -1.30
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 0.08
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 0.71
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 1.11
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 0.70
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 0.16
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> -0.77
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> -1.30
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> -1.45
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> -1.23
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> -0.56
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 0.39
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 1.24
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 1.92
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 2.18
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 2.16
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 1.82
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 1.35
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 0.75
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> 0.30
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> -0.03
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> -0.37
> >>>>> entering subroutine stress ...
> >>>>> total stress (Ry/bohr**3) (kbar)
> P=
> >>>>> -0.72
> >>>>>
> >>>>> /------------------------------------- force results
> >>>>> --------------------------------------/
> >>>>>
> >>>>> Total force = 0.072779 Total SCF correction =
> 0.000066
> >>>>> Total force = 0.053372 Total SCF correction =
> 0.000053
> >>>>> Total force = 0.044120 Total SCF correction =
> 0.000023
> >>>>> Total force = 0.045980 Total SCF correction =
> 0.000024
> >>>>> Total force = 0.049875 Total SCF correction =
> 0.000027
> >>>>> Total force = 0.043061 Total SCF correction =
> 0.000055
> >>>>> Total force = 0.033627 Total SCF correction =
> 0.000027
> >>>>> Total force = 0.024939 Total SCF correction =
> 0.000032
> >>>>> Total force = 0.022018 Total SCF correction =
> 0.000009
> >>>>> Total force = 0.015573 Total SCF correction =
> 0.000049
> >>>>> Total force = 0.013346 Total SCF correction =
> 0.000039
> >>>>> Total force = 0.010870 Total SCF correction =
> 0.000017
> >>>>> Total force = 0.010344 Total SCF correction =
> 0.000031
> >>>>> Total force = 0.016943 Total SCF correction =
> 0.000021
> >>>>> Total force = 0.015429 Total SCF correction =
> 0.000031
> >>>>> Total force = 0.013450 Total SCF correction =
> 0.000013
> >>>>> Total force = 0.015799 Total SCF correction =
> 0.000010
> >>>>> Total force = 0.023243 Total SCF correction =
> 0.000032
> >>>>> Total force = 0.028594 Total SCF correction =
> 0.000015
> >>>>> Total force = 0.038065 Total SCF correction =
> 0.000030
> >>>>> Total force = 0.044262 Total SCF correction =
> 0.000073
> >>>>> Total force = 0.048789 Total SCF correction =
> 0.000054
> >>>>> Total force = 0.053071 Total SCF correction =
> 0.000047
> >>>>> Total force = 0.057755 Total SCF correction =
> 0.000030
> >>>>> Total force = 0.061205 Total SCF correction =
> 0.000057
> >>>>> Total force = 0.063732 Total SCF correction =
> 0.000055
> >>>>> Total force = 0.065333 Total SCF correction =
> 0.000069
> >>>>> Total force = 0.067697 Total SCF correction =
> 0.000029
> >>>>> Total force = 0.071297 Total SCF correction =
> 0.000042
> >>>>> Total force = 0.075401 Total SCF correction =
> 0.000020
> >>>>> Total force = 0.080403 Total SCF correction =
> 0.000064
> >>>>> Total force = 0.086012 Total SCF correction =
> 0.000030
> >>>>> Total force = 0.091511 Total SCF correction =
> 0.000033
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >> ------------------------------------------------------------------------
> >>
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> >>>>>
> >>>>>
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> >>>>
> >>>>
> >>>>
> >>>
> ------------------------------------------------------------------------
> >>>
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