CHEATSHEET

    ,ggggggggggg,
    dP"""88""""""Y8,
    Yb,  88      `8b
    `"  88      ,8P                        gg                  gg
        88aaaad8P"                         ""                  ""
        88"""""  gg     gg   ,ggg,,ggg,    gg    ,ggg,,ggg,    gg
        88       I8     8I  ,8" "8P" "8,   88   ,8" "8P" "8,   88
        88       I8,   ,8I  I8   8I   8I   88   I8   8I   8I   88
        88      ,d8b, ,d8I ,dP   8I   Yb,_,88,_,dP   8I   Yb,_,88,_
        88      P""Y88P"8888P'   8I   `Y88P""Y88P'   8I   `Y88P""Y8
                      ,d8I'
                    ,dP'8I
                   ,8"  8I
                   I8   8I
                   `8, ,8I
                    `Y8P"

IO:
    f = Fst.read(...)
    f.write(...)
    f = string_file(...)


Compilation:
    accep("Do you have Camembert?", ...)
    cross("Do you have Camembert?", "No.", ...)
    string_map([(f, g), (h, i), ...])
    cdrewrite(cross("s", "z"), "", "[EOS]", sigma_star)

Sample operations:
    closure(f, ...)                       f.closure(...)
    compose(f, g, ...)       f @ g
    concat(f, g)             f + g        f.concat(g)
    difference(f, g, ...)    f - g
    invert(f)                             f.invert()
    optimize(f)                           f.optimize()
    project(f, ...)                       f.project(...)
                                          f.paths(...)
    shortestpath(f, ...)
                                          f.string(...)
    union(f, g, ...)         f | g        f.union(g)