Muscle can be used for Extension. Extension is related to Empire. Empire is related to Vast. 
Script is a type of Write. Marker can be used for Write. Marker is related to Birthday. 
Muscle --UsedFor--> Extension <--RelatedTo--> Empire <--RelatedTo--> Vast 
Script --IsA--> Write <--UsedFor-- Marker <--RelatedTo--> Birthday 