Don't query Nothing.

words.py

@@ -33,7 +33,7 @@ while Q:
     ((x, x_rank), (y, y_rank)), = random.sample(
         population=list(Q),
         k=1,
-        counts=[max(xr, yr) for (_, xr), (_, yr) in Q],
+        counts=[max(len(x), len(y))*max(xr, yr) for (x, xr), (y, yr) in Q],
     )
     Q.remove(((x, x_rank), (y, y_rank)))
 
@@ -67,16 +67,17 @@ while Q:
     )
     db.commit()
 
-    r = db.execute('''
-        select q.word, q.rank, z.rank
-        from words q, words z
-        where not exists (
-            select *
-            from combos c
-            where c.x = q.word and c.y = ?
-        ) and z.word = ?
-    ''', (z, z))
-    for q, q_rank, z_rank in r.fetchall():
-        Q.add(((z, z_rank), (q, q_rank)))
+    if z != 'Nothing':
+        r = db.execute('''
+            select q.word, q.rank, z.rank
+            from words q, words z
+            where not exists (
+                select *
+                from combos c
+                where c.x = q.word and c.y = ?
+            ) and z.word = ? and q.word != 'Nothing'
+        ''', (z, z))
+        for q, q_rank, z_rank in r.fetchall():
+            Q.add(((z, z_rank), (q, q_rank)))
 
     time.sleep(5)