Print int[string] sorted by Value

[Paul]

per the D sample wc2.d....
size_t[string] dictionary;  <-is printed by...
.....
foreach (word1; dictionary.keys.sort) writef ....etc

I want to print the dictionary sorted by value not key.  I can 
write an algorithm but is there a library method(s) I can use to 
iterate through the array sorted by decreasing values?

Thanks for your time.