Leap is related to Year. Year is a different concept from Second. 
Important is related to Essential. Essential is related to Primary. Primary is related to Green. Green is related to Environmental. 
Leap <--RelatedTo--> Year <--DistinctFrom--> Second 
Important <--RelatedTo--> Essential <--RelatedTo--> Primary <--RelatedTo--> Green <--RelatedTo--> Environmental 