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→{{header|Ruby}}: Add Ruby
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</pre>
=={{header|Ruby}}==
<syntaxhighlight lang="ruby">words = ["133252abcdeeffd", "a6789798st", "yxcdfgxcyz"]
counter = words.inject({}){|h, word| word.chars.tally(h)}
puts counter.filter_map{|char, count| char if count == 1}.sort.join
</syntaxhighlight>
{{out}}
<pre>
156bgstz
</pre>
=={{header|Transd}}==
<syntaxhighlight lang="Scheme">#lang transd
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