Lag in network diagrams explained (Project Management)

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Project Management Tutorial: Lag in network diagrams explained.
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[@quanganhvu4760]

Thanks mate

[@samric2000]

❤❤❤❤❤❤❤❤❤❤best lectures ever..

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🤩 thank you, smart teacher

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[@Makakamela]

this Lag is it MPM ?