Update app.py

app.py

@@ -177,9 +177,8 @@ def generate_chords(chords,
     good_outs = []
 
     for o in out:
-        if len(chords)-2 <= len(o) <= 380-len(chords)-2:
-            if len(set(o)) >= len(chords) // 2:
-                good_outs.append(o)
+        if len(set(o)) >= len(chords) // 4:
+            good_outs.append(o)
 
     if len(good_outs) > 0:
         cho_prg = sorted(good_outs, key=lambda x: -len(set(x)))[0]