• 'If you should have any free time, make sure you visit the old town.' (I don't really expect you will have any free time, but if you do...)
• 'Should you fail this exam, you can always re-take it next year.' (I think it's unlikely, but it's possible you may fail it and if you do...)
If you should see him again, walk the other way!
Should you see him again, walk the other way!
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