BUR #30342 has been approved by @nonamethanks.
create alias oil_tanker -> tanker_(ship)
create implication cargo_ship -> ship
create implication tanker_(ship) -> cargo_ship
create implication container_ship -> cargo_ship
Aliasing the oil tanker tag with another tag named tanker (ship) so it would fit any generic tanker ship that transports anything besides oil. I also populated the cargo ship as the umbrella tag for both container ship and tanker (ship) so it could be implicated to the ship tag just like the warship tag.
Updated