HI

I have a list of series like this

serie 165125
serie 165126
serie 165127
serie 165125
serie 165126
serie 165124
serie 165125

I want to count how many series I have. The formula have to consider that
some series are repeiting in many rows. ei in the list above will be 4
series.

Could anyone help me please.

Thanks,
Orquidea