Bottle is a type of Container. Bottle is related to Condition. Condition is related to Slope. Slope is related to Ladder. 
Sand is related to Dig. Dig is related to Oil. Oil is related to Essence. 
Container <--IsA-- Bottle <--RelatedTo--> Condition <--RelatedTo--> Slope <--RelatedTo--> Ladder 
Sand <--RelatedTo--> Dig <--RelatedTo--> Oil <--RelatedTo--> Essence 