remove implication prehistoric_species (73341) -> extinct (12)
remove implication mammoth (467) -> extinct (12)
remove implication recently_extinct_species (2462) -> extinct (12)
create implication mammoth (467) -> prehistoric_species (73341)
remove implication woolly_mammoth (69) -> recently_extinct_species (2462)
remove implication hydrodamalis (1) -> extinct (12)