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The default operator is "OR" e.g., if you search for pit latrine this will be interpreted as pit OR latrine and will return results matching either "pit" or "latrine"
Use AND (case-sensitive) to search for two terms, e.g., pit AND latrine will return results which match both "pit" and "latrine"
To search for the exact phrase "pit latrine", enclose the phrase in quotation marks: "pit latrine".
Use NOT (case-sensitive) to exclude terms, e.g., sanitation NOT water will return results which match "sanitation" but exclude results that also match "water".
Use * for truncation, e.g., Project.MSc.* will return projects in the following series: Project.MSc.WEM, Project.MSc.WWE, etc.
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