to participate in sport where they otherwise wouldn't be able to well mr mccreery let me add challenge that because there is still a debate in the scientific community of whether for example carbon fiber pressed prosthetics known as blades give. any advantage and despite oscar pistorius which is a patient in the london olympics the athletes have been denied that right specifically because the scientific community believes that there may be an unfair advantage why should they be treated cognitive our neural difficulties. in a presidential way should those athletes if they have those issues be competing in paralympics well i guess it all starts with establish the rules that are in place and the rules that are being enforced have the right to argue those with their peers and colleagues who is whether or not they're the rule you would agree with and i think the debate that exists is is clear and that's the nature of an association such as the olympics and such as international sport there are different approaches and different opinions and we do our best to try and establish a common appro