Can someone please help me understand this chord progression that actually takes the listener from E♭ to B♭. There is a chord at the end of the phrase and I can't understand what chord it comes from. The notes are (F A♭ E♭). Let's call this chord "X".
Here is the progression so you can get this in context.
E♭, E♭, B♭, E♭, Cdim, X, B♭