Improvement is related to Prove. Prove is related to Must. Must is related to Fate. Fate is related to Meeting. 
you are likely to find Toilet in/at/on Bathroom. Toilet is related to Plunge. Plunge is related to Fix. Fix is related to Shot. 
Improvement <--RelatedTo--> Prove <--RelatedTo--> Must <--RelatedTo--> Fate <--RelatedTo--> Meeting 
Bathroom <--AtLocation-- Toilet <--RelatedTo--> Plunge <--RelatedTo--> Fix <--RelatedTo--> Shot 