SQL
x
use commonswiki_p;
select count(distinct user_name)
from categorylinks
join page pg on page_id = cl_from
join image img on img_name = page_title
join `user` us on img_user = user_id
where cl_to = 'Images_from_Wiki_Loves_Monuments_2013_in_Chile'
and cl_type = 'file'
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