jmc

Below is a drawing of all $26$ letters in the English alphabet. As drawn below, some of these letters could be portions of the graph of a function, and some cannot. For example, the $\text{O}$ resembles an ellipse, which cannot be part of the graph of a function.

As drawn below, which of these letters could be portions of the graph of a function? (You may not rotate them.)

Give your answer as a list of letters with no spaces or other punctuation between them, in alphabetic order.

$$\begin{array}{ccccc}\text{A}& \text{B}& \text{C}& \text{D}& \text{E}\\ & & & & \\ \text{F}& \text{G}& \text{H}& \text{I}& \text{J}\\ & & & & \\ \text{K}& \text{L}& \text{M}& \text{N}& \text{O}\\ & & & & \\ \text{P}& \text{Q}& \text{R}& \text{S}& \text{T}\\ & & & & \\ \text{U}& \text{V}& \text{W}& \text{X}& \text{Y}\\ & & & & \\ & & \text{Z}& & \end{array}$$