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package collections;

import java.util.Arrays;

import java.util.HashMap;

import java.util.HashSet;

import java.util.Map;

import java.util.Set;

public class ComplexDS {

public static void main(String[] args) {

String[] emrgncy = {"Ambulance","Helicopter","Life Boat"};

String[][] drivers = {

{"D1","D2","D3"},

{"D4","D5","D6"},

{"D7","D8","D9"},

};

Map<String,Set<String>> m1 = new HashMap<>();

for(int i=0;i<emrgncy.length;i++){

String type = emrgncy[i];

Set<String> dri = new HashSet<>(Arrays.asList(drivers[i]));

m1.put(type,dri);

}

System.out.println(m1);

}

}