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confused with ballast

Hi
I've got confused with wiring a replacement electronic ballast to a 2D 4 pin 16w lamp (UK). original ballast was fully wired, replacement is not. I thought i understood but have got confused due to someone posting a picture at work, which conflicts with my belief. see ballast photo
question 1, The letters for live and neutral are replaced with alternating current symbol and a straight line. which is which?
question 2, is wires to lamp holder are 2 brown and 2 blue, i thought they went 2 brown wires to connection points 1 & 2, with the 2 blue going to connections 3 & 4. Or have i got it completely wrong reading the diagram?
can an expert put me right, please
many thanks
snubby2d 16w ballast.jpg

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