diff --git a/days/src/main/kotlin/Day16.kt b/days/src/main/kotlin/Day16.kt
index fd7ea7e..ed13e48 100644
--- a/days/src/main/kotlin/Day16.kt
+++ b/days/src/main/kotlin/Day16.kt
@@ -91,8 +91,7 @@ class Day16(@Groups val input: Input<List<List<String>>>) {
 
             val one = values.filter { it.size() == 1 }
                 .map { it.first() }
-                .find { !removed.contains(it) }
-                ?.also { removed.add(it) }
+                .find { removed.add(it) }
                 ?: error("No values left to remove")
 
             for (entry in indexesByCategory.keyMultiValuePairsView()) {