const int k = 6;

<main>
post_clear;
post_add_sobel;
post_add_gblur;
post_add_gblur;
post_add_gblur;
post_add_gblur;
post_add_gblur;
post_add_gblur;
post_add_gblur;
post_add_gblur;
post_add_gblur;
</main>
