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#### 2.7.3 RPN Tutorial Exercise 3

The `TAB` key provides a way to operate on the number in level 2.

    3:  10         3:  10         4:  10         3:  10         3:  10
    2:  20         2:  30         3:  30         2:  30         2:  21
    1:  30         1:  20         2:  20         1:  21         1:  30
        .              .          1:  1              .              .
                                      .

                      TAB             1              +             TAB

Similarly, `M-TAB` gives you access to the number in level 3.

    3:  10         3:  21         3:  21         3:  30         3:  11
    2:  21         2:  30         2:  30         2:  11         2:  21
    1:  30         1:  10         1:  11         1:  21         1:  30
        .              .              .              .              .

                      M-TAB           1 +           M-TAB          M-TAB