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while (<PROJ>) { next unless s/^(.*?),\s*//; $pr1{$1} = [ split ]; }
open (S1, "< /tmp/s1"); while (<S1>) { next unless s/^(.*?),\s*//; ... for my $key (keys %si1 ) { if (($pr1{$key1} = $sil{$key._ref1}) || $sil{$key}) print "$key: $key1\n";