diff --git a/day12/dayTwelve.go b/day12/dayTwelve.go
index 7b12bbd..35adafc 100644
--- a/day12/dayTwelve.go
+++ b/day12/dayTwelve.go
@@ -29,28 +29,16 @@ func Run() int {
 			blockLengthSum += blockLen
 		}
 
-		variants := generatePermutations("", len(mask), blockLengs, blockLengthSum)
+		variants := generatePermutations("", len(mask), blockLengs, blockLengthSum, mask)
 
 		match := 0
-		for _, variant := range variants {
-			if isVariantMatchesMask(variant, mask) {
-				match += 1
-			}
+		for range variants {
+			match += 1
 		}
-		log.Printf("for line %s matches %d\n", mask, match)
+		log.Printf("for line %s blocks %+v matches %d\n", mask, blockLengs, match)
 		sum += match
 	}
 
-	// totalVariants := 0
-	// for _, variang := range test1 {
-	// 	totalVariants += 1
-	// 	if isVariantMatchesMask(variang, line3) {
-	// 		match += 1
-	// 		fmt.Print("matches: ")
-	// 	}
-	// 	fmt.Println(variang)
-	// }
-	// fmt.Printf("total variants : %d\n", totalVariants)
 	return sum
 }
 
@@ -75,7 +63,11 @@ func ReadLine(line string) (string, []int) {
 	return mask, blockLengs
 }
 
-func generatePermutations(curString string, targetLength int, blockLengths []int, blockLengthsSum int) []string {
+func generatePermutations(curString string, targetLength int, blockLengths []int, blockLengthsSum int, mask string) []string {
+	if !isVariantMatchesMask(curString, mask) {
+		return []string{}
+	}
+
 	// log.Printf("> entering with %s\n", curString)
 	if len(blockLengths) == 0 {
 		if len(curString) > targetLength {
@@ -100,8 +92,8 @@ func generatePermutations(curString string, targetLength int, blockLengths []int
 	whenPass := curString + "."
 	whenAdd := curString + strings.Repeat("#", nextBlock) + strings.Repeat(".", rightPointRepeat)
 
-	variantsWhenPass := generatePermutations(whenPass, targetLength, blockLengths, blockLengthsSum)
-	variantsWhenAdd := generatePermutations(whenAdd, targetLength, restBlocks, blockLengthsSum - nextBlock)
+	variantsWhenPass := generatePermutations(whenPass, targetLength, blockLengths, blockLengthsSum, mask)
+	variantsWhenAdd := generatePermutations(whenAdd, targetLength, restBlocks, blockLengthsSum - nextBlock, mask)
 
 	return append(variantsWhenAdd, variantsWhenPass...)
 }