What episode in fma brotherhood does scar meet Marco?

In "Fullmetal Alchemist: Brotherhood," Scar meets Marcoh in Episode 18, titled "The Arrogant Palm of a Small Human." In this episode, Scar confronts Marcoh, who has been hiding and is initially wary of Scar's intentions. Their encounter is significant as it reveals more about Scar's motivations and the broader conflict in the series.