Perhaps you should try some spelling variations:
"supply managed irrigation systems." » "supply management irrigation systems.", "supply canal irrigation systems.", "supply large irrigation systems.", "supply manager's irrigation systems.", "safely managed irrigation systems.", "supply managed irrigation system."
"supply change mitigation schemes." » "supply change irrigation schemes.", "supply change integration schemes.", "supply change irrigation scheme.", "supply charges mitigation schemes.", "supply channels mitigation schemes.", "supply chain's mitigation schemes."

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