BUR #43766 has been rejected.
create implication https://danbooru.donmai.us/posts?tags=ninkoro&z=1 -> https://danbooru.donmai.us/posts?tags=ninja_to_koroshiya_no_futarigurashi&z=1
The phrase Ninkoro is already in several character tags, not only does it make sense to alias the two but it would also simplify looking for images related to Ninkoro.