diff --git a/exercises/block4/1-module/Volumenberechnung.hs b/exercises/block4/2-ownmodule/Volumenberechnung.hs
similarity index 100%
rename from exercises/block4/1-module/Volumenberechnung.hs
rename to exercises/block4/2-ownmodule/Volumenberechnung.hs
diff --git a/exercises/block4/1-module/modultest.hs b/exercises/block4/2-ownmodule/modultest.hs
similarity index 100%
rename from exercises/block4/1-module/modultest.hs
rename to exercises/block4/2-ownmodule/modultest.hs
diff --git a/exercises/block4/2-helloWorld/helloWorld.hs b/exercises/block4/3-helloWorld/helloWorld.hs
similarity index 100%
rename from exercises/block4/2-helloWorld/helloWorld.hs
rename to exercises/block4/3-helloWorld/helloWorld.hs
diff --git a/exercises/block4/3-oche/rueckwartsschreiber.hs b/exercises/block4/4-oche/rueckwartsschreiber.hs
similarity index 100%
rename from exercises/block4/3-oche/rueckwartsschreiber.hs
rename to exercises/block4/4-oche/rueckwartsschreiber.hs