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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