<prompt> Pin code index of N2O is1,62,52,63,5  <response>: PIn index provides prevention of wrong attachments of cylinders . N20 - 3 ,5 O2 - 2 , 5 C02 Gas - 1 ,6 . Liquid below 88F 2 , 6 ; Cyclopropane 3 , 6 . 