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var optionalString: String? = nil
if let unwrappedOptionalWithIf = optionalString {
print("Use \(unwrappedOptionalWithIf) here")
func printString(string: String?) {
guard let unwrappedOptionalWithGuard = optionalString else {
print("Treat error")
print("Use \(unwrappedOptionalWithGuard) here")
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