The left part of chocolate in Fig. 4.1.

The right part of chocolate in Fig. 4.1.

Similarly we can divide chocolates into two parts.

*
For the chocolate in Fig.4.4 the left part and the right part are
the chocolates in Fig.4.5 and Fig.4.6.
*

The left part of chocolate in Fig. 4.4.

The right part of chocolate in Fig. 4.4.

We study Grundy numbers of the left part and the right part of the chocolate with the inequality . First we define and for the left part and the right part.

For we define , where .

For we define , where .

.

if and only if . It is clear that , and hence we have .

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