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6 - square root of 35 < 0
well 35 is an awk # so lets use 36 as a model
sq root of 36 is 6
6-6 is not less than 0
since sq root of 35 is less than 36, we know that sq root of 35 is less than 6 .
6 - (any number less than 6) will never be less than 0