Python: get a frequency count based on two columns (variables) in pandas dataframe some row appers

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Hello I have the following dataframe.

    Group           Size

    Short          Small
    Short          Small
    Moderate       Medium
    Moderate       Small
    Tall           Large

I want to count the frequency of how many time the same row appears in the dataframe.

    Group           Size      Time

    Short          Small        2
    Moderate       Medium       1 
    Moderate       Small        1
    Tall           Large        1

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