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+--
+-- Perl Weekly Challenge 234
+-- Task 1
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-234/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc234;
+
+CREATE OR REPLACE FUNCTION
+pwc234.task1_plperl( text[] )
+RETURNS SETOF char
+AS $CODE$
+  my ( $words ) = @_;
+
+  my $chars = {};
+
+  for my $current_word ( $words->@* ) {
+      for my $current_char ( sort split //, $current_word ) {
+            if ( ! grep { $_ eq $current_word } $chars->{ $current_char }->@* ) {
+	     push $chars->{ $current_char }->@*, $current_word;
+	  }
+      }
+  }
+
+  for my $current_char ( keys $chars->%* ) {
+      return_next( $current_char ) if ( $chars->{ $current_char }->@* == scalar $words->@* );
+  }
+
+  return undef;
+$CODE$
+LANGUAGE plperl;