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<?php
  if ( function_exists( 'add_theme_support' ) ) { 
    add_theme_support( 'post-thumbnails' );
    set_post_thumbnail_size( 150, 150, true ); 
    
    add_image_size( 'thumb-585_320', 585, 320, true);
    add_image_size( 'thumb-1920_1080', 1920, 1080, true);
  }