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search: "painting illuminating"
Documents contain painting or illuminating.
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search: "painting -illuminating"
Documents contain painting but not illuminating.
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search: "painting +illuminating"
Documents contain painting (optional) and illuminating (mandatory).
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search: "painting +illumi*"
Documents contain painting (optional) and at least a word starting with illumi (mandatory).
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search: "illuminat~"
Documents contain illuminat with a fuzzy search so documents containing illuminating will be returned too.
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search: "painting +(illuminating || imitation)"
Documents contain painting (optional) and either illuminating or imitation (mandatory).
Simple searches are obviously also supported.
And any combination of the above...
