Crop is related to Short. Short is related to Slip. Slip is a type of Pass. Pass is related to Button. 
Lighting is related to Candle. Candle is related to Fire. Fire is related to Radiation. 
Crop <--RelatedTo--> Short <--RelatedTo--> Slip --IsA--> Pass <--RelatedTo--> Button 
Lighting <--RelatedTo--> Candle <--RelatedTo--> Fire <--RelatedTo--> Radiation 