Library is related to Story. Story is related to Written. Written is related to Number. Number is related to Like. 
Crystal is related to Clear. Liquid can be Clear. Acid is a type of Liquid. 
Library <--RelatedTo--> Story <--RelatedTo--> Written <--RelatedTo--> Number <--RelatedTo--> Like 
Crystal <--RelatedTo--> Clear <--HasProperty-- Liquid <--IsA-- Acid 