Mean is a different concept from Happy. Happy is related to Party. you are likely to find Party in/at/on City. City is related to Ruin. 
Measure is related to Calculation. Calculation is a type of Planning. Planning is related to Prepare. Qualify is a type of Prepare. 
Mean <--DistinctFrom--> Happy <--RelatedTo--> Party --AtLocation--> City <--RelatedTo--> Ruin 
Measure <--RelatedTo--> Calculation --IsA--> Planning <--RelatedTo--> Prepare <--IsA-- Qualify 