A number of positive and negative, in the number of six such random two,
Conditions to be met:
Take out the number of absolute can't repeat,

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As an example to illustrate how I want to say is:
First example: in - 6 to (get rid of 0) of the 12 randomly selected number two, such as the results can be 1 and 2, but can't be - 2 and 2;
Second example: the first random number 2 in 1 to 6, and then the two random number is positive or negative,

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