Yes. So Dana, thank you for the question. Two things, I think, that are really going to drive leverage in 2019, and really, the primarily -- primary one is leveraging SG&A. As we've noted throughout the year, we've made significant investments in advertising, stores' payroll, wages. In addition to that, we've done a number of restructuring activities in the retail field organization where we've really upgraded talent. All investments that particularly highlighting -- highlighted by Q4's quality of sale metrics in the stores, we've seen significant improvement across AUR, ADS, conversion, just the comp performance in and of itself in addition to driving comp gross margin dollar increases. So we really feel -- in addition to really driving an increased sales per associate hour metric, too. So all of those are pointing to great returns from those investments.
Looking forward to 2019, most of those investments are behind us and reflected in the base, with the exception of Q1. We really started investing heavily in store payroll, wages, all the things I mentioned, in Q2 through Q4. So Q1, we'll see continued incremental investment in those categories, in addition to just some slight increase in advertising year-over-year and some timing differences of when advertising materializes in Q1 and then flows out the rest of the year. So looking to Q1 of this year, we're really not expecting leverage or improved operating margin in light of those investments, but as we move through Qs 2 through 4, you should expect to see operating margin leverage improvement, and it's really primarily driven by SG&A leverage. The one other thing, speaking about investments or things that are different but reflected in the base in 2018, we had a very strong year this year, which drove a higher incentive compensation payout than it did the prior year. That's now baked into the base also and is reset. So we won't have that as a headwind as we look forward, too. So those are really the drivers, Dana.