Preview:
<?php

add_image_size( 'image-480', 480, 9999 );
add_image_size( 'image-640', 640, 9999 );
add_image_size( 'image-720', 720, 9999 );
add_image_size( 'image-960', 960, 9999 );
add_image_size( 'image-1168', 1168, 9999 );
add_image_size( 'image-1440', 1440, 9999 );
add_image_size( 'image-1920', 1920, 9999 );
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