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Query Syntax

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Boolean operators: AND, OR, NOT, +, -.

AND two or more search terms:   heart + lung

OR:  heart || lung

NOT:    heart - kidney

Proximity (within 4 words):  "heart lung"~4

Wild card:   hear*

AND is the default operator.

LHC field_names:

au for author

ti for title

Complex Query:

au: thoma + (image + system)