Yes. I'll take that Rob. Good morning. Sukaran here. In terms of how we construct the guidance, I'll speak to revenue first, when you just think about revenue, it's pretty straightforward in our world, take the ARR for the prior quarter, divide that by 365 -- months -- the number of days in the quarter, it gives you kind of your base for subscription revenue. A good chunk, I would say, a good 70% of our deals closed in the latter part of the quarter, meaning the last month, which is typical for enterprise companies. And so we factor in a very minimal amount of revenue flowing in from deals in quarter into revenue. And then from a professional services perspective, it really is a factor of onboarding on new deals as well as some custom SOWs that we do. So you would say that generally, you can look at it from a perspective of what the ARR in the prior quarter, which will flow into the following quarter from a PS perspective. In terms of your question around expense, the EBITDA margin, it is really straightforward, you have two factors I called out in the guidance to. One is, there is two less days in Q1 compared to the prior quarter, which almost is close to $1 million or $800,000 in revenue, that less compared to the prior quarter, just by the number of days, because of February. And then secondly, Rob, if you know, that in North America specifically, the first half of the year, you have higher social payroll taxes. And so some of that gets to you at the front end of the year, but you kind of normalize it as you go through the year. So, apples-to-apples, it will be a slight improvement, if you didn't have these two factors.