Curriculum is related to Course. Course is related to Portion. Portion is related to Size. Size is a type of Situation. 
Error is related to Trouble. Trouble is related to Kid. Kid is a synonym of Youth. Youth is related to Child. 
Curriculum <--RelatedTo--> Course <--RelatedTo--> Portion <--RelatedTo--> Size --IsA--> Situation 
Error <--RelatedTo--> Trouble <--RelatedTo--> Kid <--Synonym--> Youth <--RelatedTo--> Child 