Flat
 Usage
Notes
 Further Examples
This clears all of the rules and attributes for a symbol fff.
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This gives fff the attribute Flat.
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Inputs with a head of fff will now be flattened automatically over fff.
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The Flat attribute also has an effect in pattern matching. This rule applies because of the Flat attribute.
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This removes the Flat attribute from fff.
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Without the Flat attribute, this rule is not used.
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Associative operations, such as Plus, have the Flat attribute.
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This rule is applied because of the Flat attribute of Plus.
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This also works.
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RunLengthEncode gives a list of pairs. The pair {x, y} corresponds to a run of length y of the element x. (See the Further Examples for Split for another implementation.)
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