Add tasks for all the new languages
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func check_perm(arr) {
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(var hash = Hash.new).@{arr} = @[1]*arr.len;
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arr.each { |s|
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s.len.times {
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var t = (s.substr(1) + s.substr(0, 1));
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hash.has_key(t) || return t;
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}
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}
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}
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var perms = %w(ABCD CABD ACDB DACB BCDA ACBD ADCB CDAB DABC BCAD CADB CDBA
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CBAD ABDC ADBC BDCA DCBA BACD BADC BDAC CBDA DBCA DCAB);
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say check_perm(perms);
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