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class Pair<S extends Comparable<S>, T extends Comparable<T>> implements Comparable<Pair<S,T>>{

S first;

T second;

public Pair(S s, T t){

first = s;

second = t;

}

public boolean equals(Object another){

if(this==another) return true;

if(!(another instanceof Pair)) return false;

Pair otherPair = (Pair)another;

return this.first.equals(otherPair.first) && this.second.equals(otherPair.second);

}

public int compareTo(Pair<S,T> another){

if(this.second.compareTo(another.second) == 0) return this.first.compareTo(another.first);

else return this.second.compareTo(another.second);

}

public int hashCode(){

return first.hashCode() * 10007 + second.hashCode();

}

public String toString(){

return String.format("(%s, %s)", first, second);

}

}