Line is related to String. String is related to Stretch. 
Stretch is related to Morning. Morning is related to Period. Period is a synonym of Interval. Interval is a synonym of Season. 
Line <--RelatedTo--> String <--RelatedTo--> Stretch 
Stretch <--RelatedTo--> Morning <--RelatedTo--> Period <--Synonym--> Interval <--Synonym--> Season 