[Tutor] Creating sub-menus?

[nathan virgil]

Okay, so I changed line 84 from:

current_menu

to:

choice = current_menu, and the menu prtion seems to work fine. Only problem
now is, once I select a formula, it repeats that function over and over
again, never going back to a menu. Should I just add something like:

choice = current_menu

to each formula function?
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