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-rw-r--r--lib/PublicInbox/Search.pm1
1 files changed, 0 insertions, 1 deletions
diff --git a/lib/PublicInbox/Search.pm b/lib/PublicInbox/Search.pm
index aec459b3..3b25b662 100644
--- a/lib/PublicInbox/Search.pm
+++ b/lib/PublicInbox/Search.pm
@@ -58,7 +58,6 @@ my %bool_pfx_external = (
 );
 
 my %prob_prefix = (
-        subject => 'S',
         s => 'S', # for mairix compatibility
         m => 'Q', # 'mid' is exact, 'm' can do partial
         f => 'A', # for mairix compatibility