How do I lose 20 lbs in 2-3 months?

I currently weigh 136 and I'm 5'4-5'6 and I wanna lose some weight. I hate that my upper thighs touch a little. Also I have a bit of bby fat on my stomach and I wanna lose that now. Any tips? Any good foods to buy? Thanks!
How do I lose 20 lbs in 2-3 months?
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