anchor.diff:     MP,GXZ,2,GLT      ! mp,Poisson's ratio,material number,value
   *ENDIF
   
  +MP,MU,3,0
  +
   ! Assign properties to areas
   ! ASEL, Type, Item, Comp, VMIN, VMAX, VINC, KSWP
   ! AATT, MAT, REAL, TYPE, ESYS, SECN
  
positive.code: ET,1,PLANE183,0,,2      ! Quadratic plane strain quadrilaterals 
  ET,2,PLANE183,1,,2      ! Quadratic plane strain triangles
  ET,3,CONTA172
  
  ALLSEL
  
  
negative.code: 
  LSEL,S,LINE,,18
  NSLL,S,1
  TYPE,3
  MAT,3
  ESURF
  
  LSEL,S,LINE,,19
  NSLL,S,1
  TYPE,3
  MAT,3
  ESURF
  
  FINISH              ! Finish pre-processing
  