Somebody explain me this formula please. I need your help
=IF(E3=0;"";IF(COUNTIFS(G:G;G3;AD:AD;">="&AD3;AD:AD;"<="&AE3)>1;"WRONG";"OK"))
[TABLE="width: 472"]
<tbody>[TR]
[TD]G
[/TD]
[TD]AD
[/TD]
[TD]AE
[/TD]
[TD]
[/TD]
[/TR]
[TR]
[TD]10000571
[/TD]
[TD]13/12/2018 15:30
[/TD]
[TD]13/12/2018 19:30
[/TD]
[TD]OK
[/TD]
[/TR]
[TR]
[TD]10000571
[/TD]
[TD]13/12/2018 15:30
[/TD]
[TD]13/12/2018 19:30
[/TD]
[TD]OK
[/TD]
[/TR]
[TR]
[TD]11500834
[/TD]
[TD]06/12/2018 15:00
[/TD]
[TD]06/12/2018 21:00
[/TD]
[TD]WRONG
[/TD]
[/TR]
[TR]
[TD]
[/TD]
[TD]
[/TD]
[TD]
[/TD]
[TD]
[/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]
[/TD]
[/TR]
</tbody>[/TABLE]
=IF(E3=0;"";IF(COUNTIFS(G:G;G3;AD:AD;">="&AD3;AD:AD;"<="&AE3)>1;"WRONG";"OK"))
[TABLE="width: 472"]
<tbody>[TR]
[TD]G
[/TD]
[TD]AD
[/TD]
[TD]AE
[/TD]
[TD]
[/TD]
[/TR]
[TR]
[TD]10000571
[/TD]
[TD]13/12/2018 15:30
[/TD]
[TD]13/12/2018 19:30
[/TD]
[TD]OK
[/TD]
[/TR]
[TR]
[TD]10000571
[/TD]
[TD]13/12/2018 15:30
[/TD]
[TD]13/12/2018 19:30
[/TD]
[TD]OK
[/TD]
[/TR]
[TR]
[TD]11500834
[/TD]
[TD]06/12/2018 15:00
[/TD]
[TD]06/12/2018 21:00
[/TD]
[TD]WRONG
[/TD]
[/TR]
[TR]
[TD]
[/TD]
[TD]
[/TD]
[TD]
[/TD]
[TD]
[/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]
[/TD]
[/TR]
</tbody>[/TABLE]