- horizonfocussingThisexercisewillstrengthenyourfocussingskillsandyoureyemusclesingeneral.TomorrowI'llbefocussingonthefertilitynotoftheland,butofthepeoplefarmingit.Accordingtotheabovementionedassumptionsageneralfocussinglenscalculationformulaofrunerro...
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