Trouble is a type of Difficulty. Trouble is related to Worry. Worry is a type of Mind. Mind is a synonym of Learning. 
Determination is related to Being. Being is related to Regret. Regret is related to Have. Have is related to Fly. 
Difficulty <--IsA-- Trouble <--RelatedTo--> Worry --IsA--> Mind <--Synonym--> Learning 
Determination <--RelatedTo--> Being <--RelatedTo--> Regret <--RelatedTo--> Have <--RelatedTo--> Fly 