[3] | 1 | MODULE traldf_lap |
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| 2 | !!============================================================================== |
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| 3 | !! *** MODULE traldf_lap *** |
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[2528] | 4 | !! Ocean tracers: horizontal component of the lateral tracer mixing trend |
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[3] | 5 | !!============================================================================== |
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[2528] | 6 | !! History : OPA ! 87-06 (P. Andrich, D. L Hostis) Original code |
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| 7 | !! ! 91-11 (G. Madec) |
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| 8 | !! ! 95-11 (G. Madec) suppress volumetric scale factors |
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| 9 | !! ! 96-01 (G. Madec) statement function for e3 |
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| 10 | !! NEMO ! 02-06 (G. Madec) F90: Free form and module |
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| 11 | !! 1.0 ! 04-08 (C. Talandier) New trends organization |
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| 12 | !! ! 05-11 (G. Madec) add zps case |
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| 13 | !! 3.0 ! 10-06 (C. Ethe, G. Madec) Merge TRA-TRC |
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| 14 | !!---------------------------------------------------------------------- |
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[3] | 15 | |
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| 16 | !!---------------------------------------------------------------------- |
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| 17 | !! tra_ldf_lap : update the tracer trend with the horizontal diffusion |
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| 18 | !! using a iso-level harmonic (laplacien) operator. |
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| 19 | !!---------------------------------------------------------------------- |
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| 20 | USE oce ! ocean dynamics and active tracers |
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| 21 | USE dom_oce ! ocean space and time domain |
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[74] | 22 | USE ldftra_oce ! ocean active tracers: lateral physics |
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[3] | 23 | USE in_out_manager ! I/O manager |
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[132] | 24 | USE diaptr ! poleward transport diagnostics |
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[2528] | 25 | USE trc_oce ! share passive tracers/Ocean variables |
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[2715] | 26 | USE lib_mpp ! MPP library |
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[3] | 27 | |
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| 28 | IMPLICIT NONE |
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| 29 | PRIVATE |
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| 30 | |
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[2528] | 31 | PUBLIC tra_ldf_lap ! routine called by step.F90 |
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[3] | 32 | |
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[2715] | 33 | REAL(wp), SAVE, ALLOCATABLE, DIMENSION(:,:) :: e1ur, e2vr ! scale factor coefficients |
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[2528] | 34 | |
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[3] | 35 | !! * Substitutions |
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| 36 | # include "domzgr_substitute.h90" |
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| 37 | # include "ldftra_substitute.h90" |
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| 38 | # include "vectopt_loop_substitute.h90" |
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| 39 | !!---------------------------------------------------------------------- |
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[2528] | 40 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| 41 | !! $Id$ |
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| 42 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[3] | 43 | !!---------------------------------------------------------------------- |
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| 44 | CONTAINS |
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| 45 | |
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[2528] | 46 | SUBROUTINE tra_ldf_lap( kt, cdtype, pgu, pgv, & |
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| 47 | & ptb, pta, kjpt ) |
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[3] | 48 | !!---------------------------------------------------------------------- |
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| 49 | !! *** ROUTINE tra_ldf_lap *** |
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| 50 | !! |
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| 51 | !! ** Purpose : Compute the before horizontal tracer (t & s) diffusive |
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| 52 | !! trend and add it to the general trend of tracer equation. |
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| 53 | !! |
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| 54 | !! ** Method : Second order diffusive operator evaluated using before |
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| 55 | !! fields (forward time scheme). The horizontal diffusive trends of |
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[2528] | 56 | !! the tracer is given by: |
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[3] | 57 | !! difft = 1/(e1t*e2t*e3t) { di-1[ aht e2u*e3u/e1u di(tb) ] |
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| 58 | !! + dj-1[ aht e1v*e3v/e2v dj(tb) ] } |
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[2528] | 59 | !! Add this trend to the general tracer trend pta : |
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| 60 | !! pta = pta + difft |
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[3] | 61 | !! |
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[2528] | 62 | !! ** Action : - Update pta arrays with the before iso-level |
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[3] | 63 | !! harmonic mixing trend. |
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[2528] | 64 | !!---------------------------------------------------------------------- |
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[2715] | 65 | USE oce, ONLY: ztu => ua , ztv => va ! (ua,va) used as workspace |
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| 66 | ! |
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[2528] | 67 | INTEGER , INTENT(in ) :: kt ! ocean time-step index |
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| 68 | CHARACTER(len=3) , INTENT(in ) :: cdtype ! =TRA or TRC (tracer indicator) |
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| 69 | INTEGER , INTENT(in ) :: kjpt ! number of tracers |
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| 70 | REAL(wp), DIMENSION(jpi,jpj ,kjpt), INTENT(in ) :: pgu, pgv ! tracer gradient at pstep levels |
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| 71 | REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(in ) :: ptb ! before and now tracer fields |
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| 72 | REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(inout) :: pta ! tracer trend |
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[2715] | 73 | ! |
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[2528] | 74 | INTEGER :: ji, jj, jk, jn ! dummy loop indices |
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[2715] | 75 | INTEGER :: iku, ikv, ierr ! local integers |
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[2528] | 76 | REAL(wp) :: zabe1, zabe2, zbtr ! local scalars |
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[3] | 77 | !!---------------------------------------------------------------------- |
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| 78 | |
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[2528] | 79 | IF( kt == nit000 ) THEN |
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[3] | 80 | IF(lwp) WRITE(numout,*) |
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[2528] | 81 | IF(lwp) WRITE(numout,*) 'tra_ldf_lap : iso-level laplacian diffusion on ', cdtype |
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[3] | 82 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~ ' |
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[2715] | 83 | ! |
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| 84 | ALLOCATE( e1ur(jpi,jpj), e2vr(jpi,jpj), STAT=ierr ) |
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| 85 | IF( lk_mpp ) CALL mpp_sum( ierr ) |
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| 86 | IF( ierr /= 0 ) CALL ctl_stop( 'STOP', 'tra_ldf_lap : unable to allocate arrays' ) |
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| 87 | ! |
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[2528] | 88 | e1ur(:,:) = e2u(:,:) / e1u(:,:) |
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| 89 | e2vr(:,:) = e1v(:,:) / e2v(:,:) |
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[3] | 90 | ENDIF |
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[2528] | 91 | |
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| 92 | ! ! =========== ! |
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| 93 | DO jn = 1, kjpt ! tracer loop ! |
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| 94 | ! ! =========== ! |
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| 95 | DO jk = 1, jpkm1 ! slab loop |
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| 96 | ! |
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| 97 | ! 1. First derivative (gradient) |
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| 98 | ! ------------------- |
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[457] | 99 | DO jj = 1, jpjm1 |
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| 100 | DO ji = 1, fs_jpim1 ! vector opt. |
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[2528] | 101 | zabe1 = fsahtu(ji,jj,jk) * umask(ji,jj,jk) * e1ur(ji,jj) * fse3u(ji,jj,jk) |
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| 102 | zabe2 = fsahtv(ji,jj,jk) * vmask(ji,jj,jk) * e2vr(ji,jj) * fse3v(ji,jj,jk) |
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| 103 | ztu(ji,jj,jk) = zabe1 * ( ptb(ji+1,jj ,jk,jn) - ptb(ji,jj,jk,jn) ) |
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| 104 | ztv(ji,jj,jk) = zabe2 * ( ptb(ji ,jj+1,jk,jn) - ptb(ji,jj,jk,jn) ) |
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[457] | 105 | END DO |
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| 106 | END DO |
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[2528] | 107 | IF( ln_zps ) THEN ! set gradient at partial step level |
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| 108 | DO jj = 1, jpjm1 |
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| 109 | DO ji = 1, fs_jpim1 ! vector opt. |
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| 110 | ! last level |
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| 111 | iku = mbku(ji,jj) |
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| 112 | ikv = mbkv(ji,jj) |
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| 113 | IF( iku == jk ) THEN |
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| 114 | zabe1 = fsahtu(ji,jj,iku) * umask(ji,jj,iku) * e1ur(ji,jj) * fse3u(ji,jj,iku) |
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| 115 | ztu(ji,jj,jk) = zabe1 * pgu(ji,jj,jn) |
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| 116 | ENDIF |
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| 117 | IF( ikv == jk ) THEN |
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| 118 | zabe2 = fsahtv(ji,jj,ikv) * vmask(ji,jj,ikv) * e2vr(ji,jj) * fse3v(ji,jj,ikv) |
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| 119 | ztv(ji,jj,jk) = zabe2 * pgv(ji,jj,jn) |
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| 120 | ENDIF |
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| 121 | END DO |
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| 122 | END DO |
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| 123 | ENDIF |
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[3] | 124 | |
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| 125 | |
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[2528] | 126 | ! 2. Second derivative (divergence) added to the general tracer trends |
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| 127 | ! --------------------------------------------------------------------- |
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| 128 | DO jj = 2, jpjm1 |
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| 129 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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[2715] | 130 | zbtr = 1._wp / ( e1t(ji,jj) *e2t(ji,jj) * fse3t(ji,jj,jk) ) |
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[2528] | 131 | ! horizontal diffusive trends added to the general tracer trends |
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| 132 | pta(ji,jj,jk,jn) = pta(ji,jj,jk,jn) + zbtr * ( ztu(ji,jj,jk) - ztu(ji-1,jj,jk) & |
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| 133 | & + ztv(ji,jj,jk) - ztv(ji,jj-1,jk) ) |
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[3] | 134 | END DO |
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| 135 | END DO |
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[2528] | 136 | ! |
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| 137 | END DO ! End of slab |
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| 138 | ! |
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| 139 | ! "Poleward" diffusive heat or salt transports |
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| 140 | IF( cdtype == 'TRA' .AND. ln_diaptr .AND. ( MOD( kt, nn_fptr ) == 0 ) ) THEN |
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| 141 | IF( jn == jp_tem) htr_ldf(:) = ptr_vj( ztv(:,:,:) ) |
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| 142 | IF( jn == jp_sal) str_ldf(:) = ptr_vj( ztv(:,:,:) ) |
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[457] | 143 | ENDIF |
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[2528] | 144 | ! ! ================== |
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| 145 | END DO ! end of tracer loop |
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| 146 | ! ! ================== |
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[3] | 147 | END SUBROUTINE tra_ldf_lap |
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| 148 | |
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| 149 | !!============================================================================== |
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| 150 | END MODULE traldf_lap |
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