diff --git a/pgcollate b/pgcollate
index af9a672..8b5a7ad 100755
--- a/pgcollate
+++ b/pgcollate
@@ -14,6 +14,8 @@ for c in range(1, 0xD800):
     csr.execute("insert into t_pgcollate(t) values(%s)", (chr(c),))
 for c in range(0xE000, 0x110000):
     csr.execute("insert into t_pgcollate(t) values(%s)", (chr(c),))
+for s in ('asa', 'asb', 'assa', 'aßa', 'ata', 'bab', 'bäb', 'bac', ):
+    csr.execute("insert into t_pgcollate(t) values(%s)", (s,))
 db.commit()
 csr.execute("select * from t_pgcollate order by t")
 for r in csr: