Delete a line from a block

I want to search a string and delete it from a block . I tried using sed and awk but I am not able to figure it out. Let the blocks be like this: [MAIN] one=[1] two=[2] three=[3] three=[4] three=[5] [sub] one=[1] two=[2] three=[3] three=[4] three=[5] My need is to go inside the Main block […]

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