Must is related to Necessary. Sleep can be Necessary. Sleep is related to Shut. Shut is a synonym of Alley. 
Tactic is related to Attack. Pin is a type of Attack. Pin is related to Identification. 
Must <--RelatedTo--> Necessary <--HasProperty-- Sleep <--RelatedTo--> Shut <--Synonym--> Alley 
Tactic <--RelatedTo--> Attack <--IsA-- Pin <--RelatedTo--> Identification 