diff --git a/init.lua b/init.lua
index bf1e58a..a1ecb33 100644
--- a/init.lua
+++ b/init.lua
@@ -493,32 +493,22 @@ local function get_inv_items(player)
 	return inv_items
 end
 
-local function progressive_show_recipe(recipe, inv_items)
-	local inv_items_size = #inv_items
-	for _, item in pairs(recipe.items) do
-		local item_in_inv
-		if item:sub(1,6) == "group:" then
-			local groups = extract_groups(item)
-			for i = 1, inv_items_size do
-				local item_groups = reg_items[inv_items[i]].groups
-				if item_has_groups(item_groups, groups) then
-					item_in_inv = true
-				end
-			end
-		else
-			for i = 1, inv_items_size do
-				if inv_items[i] == item then
-					item_in_inv = true
-				end
+local function item_in_inv(item, inv_items)
+	if item:sub(1,6) == "group:" then
+		local groups = extract_groups(item)
+		for i = 1, #inv_items do
+			local item_groups = reg_items[inv_items[i]].groups
+			if item_has_groups(item_groups, groups) then
+				return true
 			end
 		end
-
-		if not item_in_inv then
-			return
+	else
+		for i = 1, #inv_items do
+			if inv_items[i] == item then
+				return true
+			end
 		end
 	end
-
-	return true
 end
 
 local function progressive_default_filter(recipes, player)
@@ -530,7 +520,14 @@ local function progressive_default_filter(recipes, player)
 	local filtered = {}
 	for i = 1, #recipes do
 		local recipe = recipes[i]
-		if progressive_show_recipe(recipe, inv_items) then
+		local recipe_in_inv = true
+		for _, item in pairs(recipe.items) do
+			if not item_in_inv(item, inv_items) then
+				recipe_in_inv = false
+			end
+		end
+
+		if recipe_in_inv then
 			filtered[#filtered + 1] = recipe
 		end
 	end