diff --git a/src/sections.zig b/src/sections.zig
index 020b6bb..59ff7c1 100644
--- a/src/sections.zig
+++ b/src/sections.zig
@@ -31,15 +31,12 @@ const Corpus = struct {
     // sorted by gid
     groups: []Group,
 
-    // convenience users and groups by column
+    // columnar users and groups of the above
     usersMulti: MultiArrayList(User),
     groupsMulti: MultiArrayList(Group),
 
-    // pointing to `users` and `groups` slices above.
     name2user: StringHashMap(usize),
-    uid2user: AutoHashMap(u32, usize),
     name2group: StringHashMap(usize),
-    gid2group: AutoHashMap(u32, usize),
     groupname2users: StringHashMap([]usize),
     username2groups: StringHashMap([]usize),
 
@@ -72,20 +69,12 @@ const Corpus = struct {
             groupsMulti.appendAssumeCapacity(group);
 
         var name2user = StringHashMap(usize).init(allocator);
-        var uid2user = AutoHashMap(u32, usize).init(allocator);
         var name2group = StringHashMap(usize).init(allocator);
-        var gid2group = AutoHashMap(u32, usize).init(allocator);
         for (users) |*user, i| {
             var res1 = try name2user.getOrPut(user.name);
             if (res1.found_existing)
                 return error.Duplicate;
             res1.value_ptr.* = i;
-
-            var res2 = try uid2user.getOrPut(user.uid);
-            if (res2.found_existing)
-                return error.Duplicate;
-
-            res2.value_ptr.* = i;
         }
 
         for (groups) |*group, i| {
@@ -93,10 +82,6 @@ const Corpus = struct {
             if (res1.found_existing)
                 return error.Duplicate;
             res1.value_ptr.* = i;
-            var res2 = try gid2group.getOrPut(group.gid);
-            if (res2.found_existing)
-                return error.Duplicate;
-            res2.value_ptr.* = i;
         }
 
         var groupname2users = StringHashMap([]usize).init(allocator);
@@ -157,9 +142,7 @@ const Corpus = struct {
             .usersMulti = usersMulti,
             .groupsMulti = groupsMulti,
             .name2user = name2user,
-            .uid2user = uid2user,
             .name2group = name2group,
-            .gid2group = gid2group,
             .groupname2users = groupname2users,
             .username2groups = username2groups_final,
         };
@@ -525,12 +508,8 @@ test "test corpus" {
 
     try testing.expectEqual(corpus.name2user.get("404"), null);
     try testing.expectEqual(corpus.name2user.get("vidmantas").?, vidmantas);
-    try testing.expectEqual(corpus.uid2user.get(42), null);
-    try testing.expectEqual(corpus.uid2user.get(128).?, vidmantas);
     try testing.expectEqual(corpus.name2group.get("404"), null);
     try testing.expectEqual(corpus.name2group.get("vidmantas").?, g_vidmantas);
-    try testing.expectEqual(corpus.gid2group.get(42), null);
-    try testing.expectEqual(corpus.gid2group.get(128).?, g_vidmantas);
 
     const membersOfAll = corpus.groupname2users.get("all").?;
     try testing.expectEqual(membersOfAll[0], name_name);