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1 2 3 4 PowerPoint Presentation

1 2 3 4

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1 2 3 4

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  1. (a) (b) PL2 PG PL2 PG PL1 PL1 PGP-Me PGP-Me S-DGD S-DGD GL3 GL2 GL1 2nd GLs 1st 1 2 3 4