title: histogram with multiple binary variables
body: <p>I have a dataset where columns represents variables and rows interviewers.
  I have 5 binary variables indicating the region where the respondent comes from (Central, South, North, East, Ovest). Central is 1 if the individual lives there, 0 otherwise. The same for the other 4 dummies.</p>
  <p>I want to visualize a bar plot or histogram, where on the y axis I have the absolute frequencies, and on the x axis I have two sub sections, 0 and 1. For each subsection I need a bar of the absolute frequencies for Central when is 0, a bar of the absolute frequencies for South when is 0, and so on. The same for the sub section 1.</p>
  <p><a href="https://i.stack.imgur.com/OJMoT.png" rel="nofollow noreferrer">Like in the figure</a></p>