diff --git a/day-12/internal/two/solve.go b/day-12/internal/two/solve.go
index ec78c5a..b4625a7 100644
--- a/day-12/internal/two/solve.go
+++ b/day-12/internal/two/solve.go
@@ -101,33 +101,31 @@ func isCorner(graph *graph, current, p, q point) bool {
 func numInnerCorner(graph *graph, current point, ns [4]point) int {
 	var corners int
 
-	if !graph.isOutOfBounds(ns[N]) && !graph.isOutOfBounds(ns[E]) {
-		if graph.sameKind(ns[N], current) && graph.sameKind(ns[E], current) &&
-			!graph.sameKind(point{current.x + 1, current.y - 1}, current) {
-			corners++
-		}
+	if isInnerCorner(graph, current, ns[N], ns[E], point{current.x + 1, current.y - 1}) {
+		corners++
 	}
 
-	if !graph.isOutOfBounds(ns[N]) && !graph.isOutOfBounds(ns[W]) {
-		if graph.sameKind(ns[N], current) && graph.sameKind(ns[W], current) &&
-			!graph.sameKind(point{current.x - 1, current.y - 1}, current) {
-			corners++
-		}
+	if isInnerCorner(graph, current, ns[N], ns[W], point{current.x - 1, current.y - 1}) {
+		corners++
 	}
 
-	if !graph.isOutOfBounds(ns[S]) && !graph.isOutOfBounds(ns[E]) {
-		if graph.sameKind(ns[S], current) && graph.sameKind(ns[E], current) &&
-			!graph.sameKind(point{current.x + 1, current.y + 1}, current) {
-			corners++
-		}
+	if isInnerCorner(graph, current, ns[S], ns[E], point{current.x + 1, current.y + 1}) {
+		corners++
 	}
 
-	if !graph.isOutOfBounds(ns[S]) && !graph.isOutOfBounds(ns[W]) {
-		if graph.sameKind(ns[S], current) && graph.sameKind(ns[W], current) &&
-			!graph.sameKind(point{current.x - 1, current.y + 1}, current) {
-			corners++
-		}
+	if isInnerCorner(graph, current, ns[S], ns[W], point{current.x - 1, current.y + 1}) {
+		corners++
 	}
 
 	return corners
 }
+
+func isInnerCorner(graph *graph, current, p, q, diagonal point) bool {
+	if !graph.isOutOfBounds(p) && !graph.isOutOfBounds(q) {
+		if graph.sameKind(p, current) && graph.sameKind(q, current) &&
+			!graph.sameKind(diagonal, current) {
+			return true
+		}
+	}
+	return false
+}