Position is related to Rest. Rest is related to Ease. Ease is a synonym of Reduce. 
Portion is related to Battle. Battle is related to Segment. Segment is related to Piece. 
Position <--RelatedTo--> Rest <--RelatedTo--> Ease <--Synonym--> Reduce 
Portion <--RelatedTo--> Battle <--RelatedTo--> Segment <--RelatedTo--> Piece 