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- a numeric expression
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- a text expression
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- a date expression
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- a boolean expression
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- a pointer
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- a picture
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- an expression
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- a variable
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- a field
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- a field or a variable
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- a file
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- a file
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- a field or a file
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- a '*'
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- a '>'
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- a '<'
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- a '>='
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- a '<='
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- a '#'
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- a '&'
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- a '|'
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- a '='
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- a '±'
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- a '<' or a '>'
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