Tube is related to Glass. Glass can be Fragile. Fragile is a synonym of Delicate. Delicate is related to Butterfly. 
Invite is related to Join. Join is related to Enroll. Enroll is a synonym of Add. 
Tube <--RelatedTo--> Glass --HasProperty--> Fragile <--Synonym--> Delicate <--RelatedTo--> Butterfly 
Invite <--RelatedTo--> Join <--RelatedTo--> Enroll <--Synonym--> Add 