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• Identical expressions

• sign(x - four) - sign(x + four) = zero
• sign(x minus 4) minus sign(x plus 4) equally 0
• sign(x minus four) minus sign(x plus four) equally zero
• signx - 4 - signx + 4 = 0

• Similar expressions

• sign(x + 4) - sign(x + 4) = 0
• sign(x - 4) - sign(x - 4) = 0
• sign(x - 4) + sign(x + 4) = 0