Question about common values across columns : <p>I have a set of 20 column, each contains number value. I would like to have a function in excel or in r or somewhere else to extract the shared values among all the columns. </p>

<p>Several of the online Venn tools can visualize and list among up to 6 columns. </p>

<p>Any tool? </p>

<p>Thanks </p>
