Light is related to Sign. Sign is related to Indicate. Indicate is a synonym of Imply. 
Fate is related to Life. Breathing can be used for Life. Breathing is related to Sigh. Sigh is related to Expression. 
Light <--RelatedTo--> Sign <--RelatedTo--> Indicate <--Synonym--> Imply 
Fate <--RelatedTo--> Life <--UsedFor-- Breathing <--RelatedTo--> Sigh <--RelatedTo--> Expression 