Mean is a different concept from Happy. Happy is related to Being. Being is related to Begin. 
Board is related to Place. Place can be used for Event. Migration is a type of Event. Immigration is a type of Migration. 
Mean <--DistinctFrom--> Happy <--RelatedTo--> Being <--RelatedTo--> Begin 
Board <--RelatedTo--> Place --UsedFor--> Event <--IsA-- Migration <--IsA-- Immigration 