change category e621_post_recursion (646) -> meta
change category grandfathered_content (3690) -> meta
change category 2nd_century (1) -> meta
create implication 2nd_century (1) -> ancient_furry_art (0)
change category formal_art (273) -> meta
change category inspired_by_formal_art (609) -> meta
create alias proper_art (0) -> formal_art (273)
create alias inspired_by_proper_art (0) -> inspired_by_formal_art (609)