Though it can be used with simple arrays only (containing text and numbers, not references).

I did the same "histogram" here with '$pseudoshuffle_with_hash'. And I'm getting different results every time, because 'srand(CONST)' doesn't influence hash. But outputs are similar. Kinda symmetric. I paste here two runs:

3)
A A A . . . C C C C C . . . . . E E E . . . G G G G G . . . . . . . . 
+. . I I I I I
A A A A A . . . C C C C C C C C C C E E E . . . . . G G G G G I I I I 
+I I I I I
A A A . . . . . C C C C C . . . . . E E E E E . . . . . . . . . . . . 
+I I I I I
A A A A A . . . . . . . . . . . . . . E E E E E . . . . . G G G G G G 
+G G G
A A A A A A A A A A . . . . . E E E E E . . . . . . . . . G G G G G G 
+G G G G
A A A A A . . . . . . . . . . . . . . . . . . E E E E E E E E E E . . 
+. . .
A A A . . . C C C C C . . . . . E E E . . . G G G G G . . . . . . . . 
+. I I I I I
A A A A A . . . C C C C C C C C C C E E E . . . . . G G G G G I I I I 
+I I I I I
A A A . . . . . C C C C C . . . . . E E E E E . . . . . . . . . . . . 
+. I I I I I
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3)
A A A A A . . . C C C . . . E E E E E . . . G G G G G . . . . . I I I 
+I I I I I I I
A A A A A . . . . . . . C C C C C C C C . . . . . E E E E E . . . . . 
+. . . . .
. . . . . . . C C C C C C C . . . . . . . . . . G G G G G G G G G . . 
+. . .
A A A A A . . . C C C . . . . . E E E E E . . . . . . . . . . I I I I 
+I I I I I I
A A A A A A A A A A . . . . . E E E E E E E E E E . . . . . G G G G G 
+G G G G
A A A A A . . . C C C . . . . . E E E E E . . . . . . . . . . I I I I 
+I I I I I
. . . . . . . C C C C C C C . . . . . . . . . . G G G G G G G G G G . 
+. . . .
A A A A A . . . . . . . C C C C C C C . . . . . E E E E E . . . . . . 
+. . . .
A A A A A . . . C C C . . . E E E E E . . . G G G G G . . . . . I I I 
+I I I I I I
[download]