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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 A Cambridge University lecturer giving a tutorial 
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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 A Cambridge University lecturer giving a tutorial 
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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 A Cambridge University lecturer giving a tutorial 
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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 A Cambridge University lecturer giving a tutorial 
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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 A Cambridge University lecturer giving a tutorial 
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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 A Cambridge University lecturer giving a tutorial 
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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 A Cambridge University lecturer giving a tutorial 
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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 A Cambridge University lecturer giving a tutorial 
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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 A Cambridge University lecturer giving a tutorial 
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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 A Cambridge University lecturer giving a tutorial 
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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 Cambridge University students in a tutorial 
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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 Cambridge University students in a tutorial 
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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 Cambridge University students in a tutorial 
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	©Si Barber. Moral rights asserted.Mandatory Credit: ? Si Barber/07739 472 922 Cambridge University students in a tutorial