Typing "epsilon" in Grapher.app (and other shortcuts)

Hi! I use grapher to format all of my mathematical forumlas for class, and, being a biochemistry student with a minor in physics, and given that I take all my in-class notes on my MBP, I have to type a lot of them. Fast. The alt-codes allow me to type most of the symbols I need, with a few exceptions, the most notable being the Greek letters sigma and epsilon. It's much too time-consuming to use the equation pallete, so a shortcut is essential. I have figured out that typing "sigma" with "Use shortcuts while typing" checked, will produce a lowercase sigma. However, I cannot find a shortcut for epsilon. Typing "epsilon" doesn't work, because grapher just sees the psi and interprets it as "elon."

And just for clarity, by epsilon, I do not mean (which is actually capital sigma), but rather . (not sure if those will translate properly to HTML, but nothing's stopping me from trying.)