diff --git a/1.hs b/01.hs similarity index 100% rename from 1.hs rename to 01.hs diff --git a/1.txt b/01.txt similarity index 100% rename from 1.txt rename to 01.txt diff --git a/2.hs b/02.hs similarity index 100% rename from 2.hs rename to 02.hs diff --git a/2.txt b/02.txt similarity index 100% rename from 2.txt rename to 02.txt diff --git a/3.hs b/03.hs similarity index 100% rename from 3.hs rename to 03.hs diff --git a/4.hs b/04.hs similarity index 100% rename from 4.hs rename to 04.hs diff --git a/4.txt b/04.txt similarity index 100% rename from 4.txt rename to 04.txt diff --git a/5.hs b/05.hs similarity index 100% rename from 5.hs rename to 05.hs diff --git a/5.txt b/05.txt similarity index 100% rename from 5.txt rename to 05.txt diff --git a/5_alt.hs b/05_alt.hs similarity index 100% rename from 5_alt.hs rename to 05_alt.hs diff --git a/6.hs b/06.hs similarity index 100% rename from 6.hs rename to 06.hs diff --git a/6.txt b/06.txt similarity index 100% rename from 6.txt rename to 06.txt diff --git a/7.hs b/07.hs similarity index 100% rename from 7.hs rename to 07.hs diff --git a/7.txt b/07.txt similarity index 100% rename from 7.txt rename to 07.txt diff --git a/7_cumulate.txt b/07_cumulate.txt similarity index 100% rename from 7_cumulate.txt rename to 07_cumulate.txt diff --git a/7_tree.txt b/07_tree.txt similarity index 100% rename from 7_tree.txt rename to 07_tree.txt diff --git a/8.hs b/08.hs similarity index 100% rename from 8.hs rename to 08.hs diff --git a/8.txt b/08.txt similarity index 100% rename from 8.txt rename to 08.txt diff --git a/9.hs b/09.hs similarity index 100% rename from 9.hs rename to 09.hs diff --git a/9.txt b/09.txt similarity index 100% rename from 9.txt rename to 09.txt