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define population as Integer attribute
define City as category with attributes name and population
define city as City attribute
define Person as category with attributes name and city, and methods:

    define complexCompareTo as method receiving Person person doing:
        if city.name[0] = name[0]:
            if city.population > person.city.population:
                return 1
            else if city.population < person.city.population:
                return -1
            else:
                return 0
        else :
            if name < person.name:
                return 1
            else if name > person.name:
                return -1
            else:
                return 0


define main as method doing:
    atlanta = City with "Atlanta" as name and 500000 as population
    perpignan = City with "Perpignan" as name and 120000 as population
    peter = Person with "Peter" as name and perpignan as city
    john = Person with "John" as name and perpignan as city
    alan = Person with "Alan" as name and atlanta as city
    list = [ peter, john, alan ]
    printLine "sorted -> " + sorted list with (p1, p2) => p1.complexCompareTo p2 as key