@class NSMutableDictionary, NSMutableArray; @interface NSISPlaybackOperation : NSObject { NSMutableDictionary *oldIdentsToNewVariables; NSMutableArray *variableDelegates; } - (id)init; - (void)dealloc; - (void)_addToEngine:(id)a0; - (id)unwrapVariable:(id)a0; - (void)playbackOneAction:(id)a0 onEngine:(id)a1; - (id)unwrapLinearExpression:(id)a0 onEngine:(id)a1; @end