I have a long list of various components that I want to summarize. For example:

Column A Column B
Material 1 Thickness 1
Material 1 Thickness 2
Material 2 Thickness 1
Material 1 Thickness 1

I want to summarize this data so that it will produce a list as follows:

Column A Column B
Material 1 Thickness 1
Material 1 Thickness 2
Material 2 Thickness 1

Many thanks in advance!