(subclass LiquidDrop Substance) | Geography.kif 7488-7488 | Liquid drop is a subclass of substance |
(subclass Raindrop LiquidDrop) | Weather.kif 2962-2962 | Rain drop is a subclass of liquid drop |
(subclass Droplet LiquidDrop) | Geography.kif 7519-7519 | Droplet is a subclass of liquid drop |