What if 2 pairs of nameservers have the same IPS?

People please help me answer this question....

What happens if I have 2 pairs of nameservers sharing the same pair of IPs? For example ns1.adfds.com and ns1.qweqwe.com share 789.456.456.456 and ns1.adfds.com and ns1.qweqwe.com share 798.456.456.457?

 

 

 

 

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