Fix issue where solution is in perfect order

domain/src/commonMain/kotlin/ch/dissem/yaep/domain/items.kt

@@ -138,6 +138,7 @@ enum class Transportation(symbol: String) : ItemClass<Transportation> {
     companion object : ItemClassCompanion<Transportation> {
         override val items: List<Transportation> = entries
     }
+
 }
 
 private val GENDERS = arrayOf("\uD83E\uDDD1", "\uD83D\uDC68", "\uD83D\uDC69")
@@ -150,13 +151,17 @@ private fun idic(symbol: String): Array<String> = Array(GENDERS.size * SKIN_TONE
     g + t + symbol
 }
 
-sealed interface ItemClass<out SELF : ItemClass<SELF>> {
+sealed interface ItemClass<out SELF : ItemClass<SELF>>: Comparable<ItemClass<*>> {
     val symbols: Array<String>
 
     val name: String
 
     val companion: ItemClassCompanion<SELF>
 
+    val ordinal: Int
+
+    override fun compareTo(other: ItemClass<*>): Int = ordinal.compareTo(other.ordinal)
+
     companion object {
         val classes: List<ItemClassCompanion<*>> = listOf(
             Nationality,