Perhaps you should try some spelling variations:
irrigation requirements » irrigation equipment, nutrition requirements
simulation environments » simulation environment, population environment, population environmental
dimensional arrays » dimensional array, dimensional nanoarrays, dimensional terrain
debra dimensional » zero dimensional, data dimensional, extra dimensional
arrays from » rays from, bioarrays from

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• Performing a fuzzy search may retrieve terms with similar spellings: ((irrigation requirements) or (simulation environments)) debra dimensional arrays from~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((irrigation requirements) OR (simulation environments)) debra dimensional arrays from.
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