The Prologue is all that precedes the Parode of the chorus; an Episode all that comes in between two whole choral songs; the Exode all that follows after the last choral song.
The prolusion needs to be designed well, a exquisite and claptrap prolusion can grasp the attention of the audienc immediately and it lays a good foundation for a successful demostration.
(CrashCourse Intro plays) The category of amorphous solids includes things that you might expect, like foams and gels and colloids, like mayonnaise, rubber, waxes, and some biological tissues such as fat.
The first one is what I call the strong first line, is whenever you're gonna speak English or be in a situation where you speak English, have your first line ready.