How to get data to flow from one sheet to other sheet and vice versa

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I have 2 sheets which have project related details. Some of details from Sheets 1 are same as of Sheet 2.

so what i want to do is when i change any details in Sheet 1, it should reflect in Sheet 2 and also when made changes in Sheet 2 it should reflect in Sheet 1

Can anyone help in this?

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