These Grundy numbers are on the diagonal part of the table of Grundy numbers.

See numbers on blue rectangles in Example 5.2.

These Grundy numbers are above in the table of Grundy numbers.

See numbers on red rectangles in Example 5.2.

Grundy numbers in are on the left side of in the table of Grundy numbers.

See numbers on yellow rectangles in yellow Example 5.2.

Let .

**Example 5.2**
*Let
. Then
is on the rectangle colored in green.
Grundy numbers of
are in blue rectangles.
Grundy numbers of
are in red rectangles.
Grundy numbers of
are in yellow rectangles.
*

**Next:** The structure of Grundy numbers
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