From f49b9815642c45912ca8a376a605243a52dfe9eb Mon Sep 17 00:00:00 2001
From: Olly Betts <olly@survex.com>
Date: Fri, 11 Oct 2024 15:25:10 +1300
Subject: [PATCH] Update for German -erin, -erinnen change

See https://github.com/snowballstem/snowball/issues/85
See https://github.com/snowballstem/snowball/issues/161
---
 algorithms/german/stemmer.tt | 6 ++++--
 code/german.sbl              | 1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/algorithms/german/stemmer.tt b/algorithms/german/stemmer.tt
index d65ae18..f31588a 100644
--- a/algorithms/german/stemmer.tt
+++ b/algorithms/german/stemmer.tt
@@ -79,10 +79,12 @@ Step 1:
         (<I>b</I>) <B><I>ern  &nbsp;  er</I></B><BR>
         (<I>c</I>) <B><I>e  &nbsp;  en  &nbsp;  es</I></B><BR>
         (<I>d</I>) <B><I>s</I></B> (preceded by a valid <B><I>s</I></B>-ending)<BR>
-        (<I>e</I>) <B><I>ln  &nbsp;  lns</I></B> [added in Snowball 2.3.0]
+        (<I>e</I>) <B><I>erin  &nbsp;  erinnen</I></B> [added in Snowball 2.3.0]<BR>
+        (<I>f</I>) <B><I>ln  &nbsp;  lns</I></B> [added in Snowball 2.3.0]
 </DL>
     <p>
-    and if in <I>R</I>1 then delete (for (a) to (d)) or replace with <I>l</I> (for (e)). (Of course the letter of the valid <B><I>s</I></B>-ending is
+    and if in <I>R</I>1 then delete (for (a) to (e)) or replace with <I>l</I> (for (f)).
+    (Of course the letter of the valid <B><I>s</I></B>-ending is
     not necessarily in <I>R</I>1.) If an ending of group (<I>c</I>) is deleted, and the ending
     is preceded by <B><I>niss</I></B>, delete the final <B><I>s</I></B>.
     </p>
diff --git a/code/german.sbl b/code/german.sbl
index da55595..c0973c7 100644
--- a/code/german.sbl
+++ b/code/german.sbl
@@ -89,6 +89,7 @@ backwardmode (
                     delete
                 )
                 'ern' 'er'
+                'erin' 'erinnen' // conflate female versions of nouns
                 (   delete
                 )
                 'e' 'en' 'es'