Talvez debería tentar con algunhas variantes ortográficas:
irrigation requirements » irrigation equipment, nutrition requirements
requirements services » requirements service, requirements sources, requirements section
services provision » service provision, services division, service provisioning
array string » array strong, array sharing, array forming

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• The words AND, OR and NOT may confuse the search; try adding quotes: "irrigation requirements services provision ((array string) OR (arrays strings))~".
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