diff --git a/utils/const.py b/utils/const.py
new file mode 100644
index 0000000..28bcce9
--- /dev/null
+++ b/utils/const.py
@@ -0,0 +1,8 @@
+DEFAULT_SINGLE_LAYERS = {}
+for i in range(38):
+    DEFAULT_SINGLE_LAYERS[f'{i}'] = i > 19
+
+DEFAULT_DOUBLE_LAYERS = {}
+for i in range(19):
+    DEFAULT_DOUBLE_LAYERS[f'{i}'] = False
+