Value of OK is 1 a - a Ok a - b Ok b - c Ok c - d Ok d - e Ok e - f Ok f - g Ok Value of OK is 1 Sequence is good ---------------------------------------- Value of OK is 1 a - a Ok a - b Ok b - c Ok c - d Ok d - e Ok e - f Ok f - g Ok g - a Not Ok a - b Ok b - c Ok c - d Ok d - e Ok Value of OK is 0 Sequence is bad