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The standard deviation of n numbers $$x_1$$, $$x_2$$, $$x_3$$,…, $$x_n$$, with mean x is equal to $$\sqrt{\frac{S}{n}}$$ , where S is the sum of the squared differences, ($$x_i, - x)^{2}$$ for 1 ≤ i ≤ n.

If the standard deviation of the 5 number 20-2c, 20-c, 20, 20+c, and 20+2c is greater than 6, which of the following could be the value of c? Indicate all such values.