Space is related to Fiction. Fantasy is a type of Fiction. Fantasy is related to Wild. 
Current is related to Liquid. Liquid is related to Like. Like is related to Apple. Apple is related to Pine. 
Space <--RelatedTo--> Fiction <--IsA-- Fantasy <--RelatedTo--> Wild 
Current <--RelatedTo--> Liquid <--RelatedTo--> Like <--RelatedTo--> Apple <--RelatedTo--> Pine 