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Create a histogram map from a list
Given the list 
perl
perl
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[a,b,a,c,b,b], produce a map {a:2, b:3, c:1} which contains the count of each unique item in the list
foreach(@list) {
$histogram{$_}++;
}
$histogram{$_}++;
}
$histogram{$_}++ for @list;
Submit a new solution for perl
There are 37 other solutions in additional languages (clojure, cpp, csharp, erlang ...)
