diff --git a/30-inverse-multiplexer/README.md b/30-map-reduce/README.md
similarity index 100%
rename from 30-inverse-multiplexer/README.md
rename to 30-map-reduce/README.md
index 6fd8e3b..ccdfcf6 100644
--- a/30-inverse-multiplexer/README.md
+++ b/30-map-reduce/README.md
@@ -11,5 +11,5 @@ Constraints:
 
 Possible names:
 
-- Inverse multiplexer (check out electronics)
 - Map-reduce
+- Inverse multiplexer (check out electronics)
diff --git a/30-inverse-multiplexer/tf-30.py b/30-map-reduce/tf-30.py
similarity index 100%
rename from 30-inverse-multiplexer/tf-30.py
rename to 30-map-reduce/tf-30.py
diff --git a/31-double-inverse-multiplexer/README.md b/31-double-map-reduce/README.md
similarity index 91%
rename from 31-double-inverse-multiplexer/README.md
rename to 31-double-map-reduce/README.md
index 85047dc..08ed8b7 100644
--- a/31-double-inverse-multiplexer/README.md
+++ b/31-double-map-reduce/README.md
@@ -1,7 +1,7 @@
 Style #31
 ==============================
 
-Very similar to style #29, but with an additional twist
+Very similar to style #30, but with an additional twist
 
 Constraints:
 
@@ -17,6 +17,6 @@ Constraints:
 
 Possible names:
 
-- Double inverse multiplexer 
 - Map-reduce 
 - Hadoop style
+- Double inverse multiplexer 
diff --git a/31-double-inverse-multiplexer/tf-31.py b/31-double-map-reduce/tf-31.py
similarity index 100%
rename from 31-double-inverse-multiplexer/tf-31.py
rename to 31-double-map-reduce/tf-31.py