add a row to df that counts up the number of actual data points of pokemon cards available in the dataset

[xerroxcopy]

df_series's cards_total includes non-pokemon cards. To simulate random draw, we need to align this to the actual datapoints. otherwise the total number of cards will be greater than nrow(df_gene), resulting in over-copied pokemons in the frequency distribution:

[xerroxcopy]

df_series2