Given the following grammar for a part of a carbohydrate followed by an optional decimal integer greater than $1$:

$(1)$ Carb $->$ Atom OptNum

$(2)$ Atom $->$ C

$(3)|$ H

$(4)|$ O

$(5)$ OptNum $->$

$(6)|1$ D$0$ OptInt

$(7)|$ D$2$ OptInt

$(8)$ OptInt $->$

$(9)|$ D$0$ OptInt

where C$,$ H$,$ O$,1,$ D$0,$ and D$2$ are terminal symbols and Carb, Atom, OptNum, and OptInt are non$-$terminal symbols. $($D$0$ represents a digit between $0$ and $9$ and D$2$ represents a digit between $2$ and $9,$ but we'll treat them as terminal symbols$).$

Let $ denote end of file. Which of the terminal symbols are in the set FOLLOW$($Carb$)?$