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with posts_2010 as (select distinct owneruserid
from posts where year(creationdate) = 2010),
posts_2015 as (select distinct owneruserid
from posts where year(creationdate) = 2015)
select distinct u.displayname from users u
join posts_2010 p10 on u.id = p10.owneruserid
left join posts_2015 p15 on u.id = p15.owneruserid
where p15.owneruserid is null;

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