Correct is a synonym of Reform. Reform is a type of Improvement. Improvement is a type of Condition. 
Crop is a type of Plant. Plant is a synonym of Establish. Establish is a synonym of Install. 
Correct <--Synonym--> Reform --IsA--> Improvement --IsA--> Condition 
Crop --IsA--> Plant <--Synonym--> Establish <--Synonym--> Install 