From 12572889a188506a50cb5ff31a813aa108c120b9 Mon Sep 17 00:00:00 2001
From: Gabriel Tofvesson <gabto095@student.liu.se>
Date: Wed, 6 Nov 2019 06:22:10 +0100
Subject: [PATCH] Remove single-element permutations

---
 src/dev/w1zzrd/math/Permutation.kt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/dev/w1zzrd/math/Permutation.kt b/src/dev/w1zzrd/math/Permutation.kt
index 4ce08c2..a5b41a5 100644
--- a/src/dev/w1zzrd/math/Permutation.kt
+++ b/src/dev/w1zzrd/math/Permutation.kt
@@ -22,6 +22,7 @@ class Permutation {
      */
     operator fun times(perm: Permutation)
             = Permutation(this(*perm(*orderedElements)).zip(orderedElements)    // Generate transpositions
+        .filterNot{ it.first == it.second }
         .foldRight(ArrayList<Pair<Char, Char>>()){                              // Deduplicate transpositions
                 insert, acc ->
             acc.firstOrNull {
@@ -47,4 +48,4 @@ class Permutation {
 
         return elements
     }
-}
\ No newline at end of file
+}