https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwj0yqChgPbUAhVBeD4KHXnPDJsQFggwMAE&url=http%3A%2F%2Fwww.perlmonks.org%2F%3Fnode%3Drandomly%2520choosing%2520elements%2520from%2520an%2520array&usg=AFQjCNEYUua_3UVPyzYBRG4ruf_ZfYRTXw