you would Dance because Fun. Laser can be used for Fun. Laser is a type of Light. Light is related to Moon. 
Assembly is a type of Whole. Assembly is related to Part. Part is related to Word. 
Dance --MotivatedByGoal--> Fun <--UsedFor-- Laser --IsA--> Light <--RelatedTo--> Moon 
Whole <--IsA-- Assembly <--RelatedTo--> Part <--RelatedTo--> Word 