Create an entity-relationship diagram (ERD) for the conference "program committee and track" management system based on the following information:

"A conference has many tracks (categories) and one program committee is appointed as a track director to manage the track".

"In order to distribute properly session topics in a conference, each track can have many sessions and at least one session is assigned to a track"

"A program committee member could manage many track sessions but a program committee member might not manage any track session at all. However, at least one program committee member is assigned to manage a track session"

(1) Identify reasonable entities for the system. 

(2) Identify relationships (one-to-one, one-to-many, or many-to-many) using the crow's foot notation among these entities.

(3) Write sentences explaining the left-to-right and right-to-left relationships for each relationsh