Pie is related to Slice. Slice is a synonym of Fade. Fade is a synonym of Weaken. Weaken is derived from Weak. 
Vertical is related to Climb. 
Pie <--RelatedTo--> Slice <--Synonym--> Fade <--Synonym--> Weaken --DerivedFrom--> Weak 
Vertical <--RelatedTo--> Climb 