So you're okay with that, ten take away A minus, ten take away A add B will be ten take away A and then take away B. But if we do ten take away like we've been doing here, A minus B and it comes out the same as this, it'll be ten take away plus A, just take away A, and then take away minus B. Well taking away a minus B is the same as adding B. Erm do you remember the table?