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Table 2 One to one function

From: A group from Hackenbush game

Integer numbers (Z)   Sets of classes
. . .
. . .
. . .
− 2 Class of − 2 game
− 1 Class of − 1 game
0 Class of 0 game
1 Class of 1 game
2 Class of 2 game
. . .
. . .
. . .