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#import <Foundation/Foundation.h>
@interface Singleton : NSObject
+ (Singleton*)sharedManager;
@property (nonatomic, strong) NSString* singletonData;
@implementation Singleton
@synthesize singletonData = _singletonData;
static Singleton *sharedManager = nil;
+ (Singleton*)sharedManager
static dispatch_once_t once;
sharedManager = [[self alloc] init];
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