sentences: if something humps from something else then that something else is a sink of that something
docs: hijacking is unnatural_thing. picking is unnatural_thing. stealing_storage_space is unnatural_thing. trying_to_steal_information is unnatural_thing. trying_to_take_hostage is unnatural_thing. throwing_spear is unnatural_thing. condensate_field is unnatural_thing. sink is tangible_thing. stealing is unnatural_thing. bucket is containerful.