I have a number of different locations which have failed over the past 2 years.
I have a record of the date (day-month-year) of when each location has failed.

I am trying to determine the clearest way to show that, for example, location A has failed on date Z, Y & X.

A snippet of my data would read as follows

Location Failed
A 11/02/2013 & 28/01/2013 & 4/06/2012
B 2/04/2013 & 20/01/2013
C 13/07/2012

Any help would be appreciated because I am struggling with this.