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init python:
    from lambcalc import *

# https://www.renpy.org/doc/html/save_load_rollback.html
# terms is a Ren'Py list with rollback capabilities
label level(id, terms):
    $ N = len(terms)
    $ i = 1
    narrator "Level [id]"
    while not all(type(term) is int for term in terms):
        # https://www.renpy.org/doc/html/statement_equivalents.html
        narrator "[i].1 Select eater" (interact=False)
        $ fn = renpy.display_menu(list(zip(map(animal_repr, terms), range(N))))
        narrator "[i].2 Select food" (interact=False)
        $ arg = renpy.display_menu(list(zip(map(animal_repr, terms), range(N))))
        # Replace arg because if we did the other way around
        # Then it would be impossible to get rid of A terms because they aren't funcs
        $ terms[arg] = red(A(terms[fn], terms[arg]))
        $ i += 1
    narrator "Level cleared! Select any option to continue." (interact=False)
    $ renpy.display_menu(list(zip(map(animal_repr, terms), range(N))))
    return