Introduce is related to Invite. Challenge is a type of Invite. Challenge is related to Difficult. Difficult is related to Complicated. 
Pound is a type of Software. Wine is a type of Software. 
Introduce <--RelatedTo--> Invite <--IsA-- Challenge <--RelatedTo--> Difficult <--RelatedTo--> Complicated 
Pound --IsA--> Software <--IsA-- Wine 