So it is hard to build software that will predict how, for example, the wing will maintain its hold on the fuselage during flight.

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Blair's late long-range penalty brought the hosts level after Nacewa's try, scored after Blues wing debutant Richard Mustoe failed to hold on to a high ball.

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Enckelman's suspect handling was exposed when he failed to hold John Utaka's low right-wing cross and striker Kanu capitalised.

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