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Farming

 * Match
 * Wood ash
 * Charcoal
 * Phosphorus
 * Sulfur
 * Maize
 * Fertilizer
 * Wheat
 * Rye
 * Nixtamalization
 * Hominy
 * Calcium hydroxide
 * Lye
 * Soap
 * Magnesium
 * Potassium
 * Alkali
 * Potash