I made changes in my Google Colab, but they are not saved at all, how do I solve this?

[Nida210303]

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[Nida210303]

I made changes in my Google Colab, but they are not saved at all, how do I solve this?

[Nida210303]

I made changes in my Google Colab, but they are not saved at all, how do I solve this?