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  public void setInHashset(String key, String field, Set<String> value) {
        try {
            redisHashCommands.hset(key, field, JSONConvertUtils.toString(value));
đoạn code trên được nhận xét 
assuming we value contains 2 IPs: ip1, ip2
=> what is the value stored in redis
I'm a bit confused why we use JSONConvertUtils here
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