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Title: Update osa4.md by villeheilala · Pull Request #87 · fullstackopen/fullstackopen.github.io · GitHub

Open Graph Title: Update osa4.md by villeheilala · Pull Request #87 · fullstackopen/fullstackopen.github.io

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Description: .remove() deprecated -> .deleteMany

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8a0de6c Update osa4.md villeheilala Nov 5, 2018 https://patch-diff.githubusercontent.com/fullstackopen/fullstackopen.github.io/pull/87/commits/8a0de6c6dfc4cfec9d19622844a7ce62c0dbfaff
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