Contents 
Associative Arrays
For the following messages, map stands for an associative array or a reference to one.
map<<First
Returns the first key within map, or Empty() if map has no keys. Note that keys are returned in lexicographical order.
map<<Get Contents
Returns a list of all key-value pairs within map.
map<<Get Keys
Returns a list of all the keys within map.
map<<Get Default Value()
Returns the implicit value of all absent keys, or Empty() if none has been set.
map<<Get Value(key)
Returns the value for the key

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