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// Standard Size Thumbnail
if(false === get_option("thumbnail_crop")) {
     add_option("thumbnail_crop", "1"); }
     else {
          update_option("thumbnail_crop", "1");
     }
 
// Medium Size Thumbnail
if(false === get_option("medium_crop")) {
     add_option("medium_crop", "1"); }
     else {
          update_option("medium_crop", "1");
     }
 
// Large Size Thumbnail
if(false === get_option("large_crop")) {
     add_option("large_crop", "1"); }
     else {
          update_option("large_crop", "1");
    }