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Spatial heterogeneity of concentration estimates is extreme , varying over many orders of magnitude for closely spaced discrete samples . In the meantime , Tucker had brought down the face of the precipice all that was necessary , including a blacksmith shop . Family engagement at the implementation stage is key , according to the officials interviewed . Thus , some trees are entirely male , producing no seeds ; some are entirely female ; and some are monoecious , bearing both male and female flowers . A range of courses is available , focusing on everything from ancient Greek grammar to the modern economy of the country .