change category e621_post_recursion (658) -> meta
change category grandfathered_content (3689) -> meta
change category 2nd_century (1) -> meta
create implication 2nd_century (1) -> ancient_furry_art (0)
change category formal_art (279) -> meta
change category inspired_by_formal_art (645) -> meta
create alias proper_art (0) -> formal_art (279)
create alias inspired_by_proper_art (0) -> inspired_by_formal_art (645)