diff --git a/src/aoc2024/Day12.kt b/src/aoc2024/Day12.kt
index 0fcab9e..3e952ef 100644
--- a/src/aoc2024/Day12.kt
+++ b/src/aoc2024/Day12.kt
@@ -55,6 +55,7 @@ MMMISSJEEE
         val grid = CharGrid(input)
         var sum = 0
         val magic = listOf(3, 5, 10, 12)
+        val star = CharGrid.PLUS_POS.plus(CharGrid.CROSS_POS)
         for (p in grid.generateGridPos()) {
             val c = grid[p]
             if (c != '.') {
@@ -70,10 +71,9 @@ MMMISSJEEE
                     newPos = newSeeds
                 }
                 val corners = areaPos.sumOf {
-                    val plusCode = CharGrid.PLUS_POS.mapIndexed { index, relPos -> if (areaPos.contains(it.translate(relPos))) 1 shl index else 0 }.sum()
-                    val crossCode = CharGrid.CROSS_POS.mapIndexed { index, relPos -> if (areaPos.contains(it.translate(relPos))) 1 shl index else 0 }.sum()
-                    val outer = magic.count { plusCode and it == 0 }
-                    val inner = magic.filterIndexed { i, m -> (plusCode and m == m) && (crossCode and (1 shl i) == 0) }.count()
+                    val b = star.mapIndexed { i, rp -> if (areaPos.contains(it.translate(rp))) 1 shl i else 0 }.sum()
+                    val outer = magic.count { b and it == 0 }
+                    val inner = magic.filterIndexed { i, m -> (b and m == m) && (b and (16 shl i) == 0) }.count()
                     outer + inner
                 }
                 sum += areaPos.size * corners