Java Singleton Pattern

Hacker
Rank
Score
81307
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81307
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81307
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81307
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81307
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81307
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81307
flag of Argentina
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81307
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81307
flag of Argentina
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81307
flag of India
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81307
flag of India
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81307
flag of India
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81307
flag of United States
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81307
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81307
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