title: Plot 'ranges' of variable in data
body: <p>I have observations in the form of ranges
  For eg: A 13-20, B 15-30, C 23-40, D 2-11
  I want to plot them in R in form of the starting value and the end value for eg. 13 and 20 for A(upper and lower limits if you may say) in order to visualize and find out what ranges are common to certain combinations of observations. Is there a quick way to do this in R ? I think this is a very trivial problem I am having but I cant think of anyway to do it right now. </p>