Two top-down levels

levels/top-down/rebase/description

@@ -0,0 +1 @@
+Rebase all branches on top of the main branch, so that the commits are in alphabetical order, and then point the main branch to the top commit.

levels/top-down/rebase/goal

@@ -0,0 +1,9 @@
+git switch side1
+git rebase main
+git switch side2
+git rebase side1
+git switch main
+git merge side2
+
+git reflog expire --expire=all --all
+git prune

levels/top-down/rebase/start

@@ -0,0 +1,12 @@
+git commit --allow-empty -m A
+git commit --allow-empty -m B
+git commit --allow-empty -m C
+
+git switch -c side1 main~1
+git commit --allow-empty -m D
+git commit --allow-empty -m E
+
+git switch -c side2 main~2
+git commit --allow-empty -m F
+
+git checkout main

levels/top-down/rebase/win

@@ -0,0 +1 @@
+diff <(git log --pretty=%s main) <(echo -e "F\nE\nD\nC\nB\nA")