Had they invested in new technology, their products wouldn’t have become outdated. - They didn’t invest in new technology. Their products became outdated., Had she followed the instructions, she wouldn’t have made a big mistake. - She didn’t follow the instructions. She made a big mistake., Had we left early, we wouldn’t have missed the flight. - We didn’t leave early. We missed the flight., Should you need a refund, you must keep the receipt. - If you need a refund, you must keep the receipt., Should you visit London, you should see the Tower of London - If you visit London, you should see the Tower of London,

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