diff --git a/dev-1/problems-demo/LICENSE b/dev-1/lesson-8.3/problems-demo/LICENSE similarity index 100% rename from dev-1/problems-demo/LICENSE rename to dev-1/lesson-8.3/problems-demo/LICENSE diff --git a/dev-1/problems-demo/README.md b/dev-1/lesson-8.3/problems-demo/README.md similarity index 100% rename from dev-1/problems-demo/README.md rename to dev-1/lesson-8.3/problems-demo/README.md diff --git a/dev-1/problems-demo/cmd/loadWithIntervals.go b/dev-1/lesson-8.3/problems-demo/cmd/loadWithIntervals.go similarity index 100% rename from dev-1/problems-demo/cmd/loadWithIntervals.go rename to dev-1/lesson-8.3/problems-demo/cmd/loadWithIntervals.go diff --git a/dev-1/problems-demo/cmd/longTransaction.go b/dev-1/lesson-8.3/problems-demo/cmd/longTransaction.go similarity index 100% rename from dev-1/problems-demo/cmd/longTransaction.go rename to dev-1/lesson-8.3/problems-demo/cmd/longTransaction.go diff --git a/dev-1/problems-demo/cmd/manyIndexes.go b/dev-1/lesson-8.3/problems-demo/cmd/manyIndexes.go similarity index 100% rename from dev-1/problems-demo/cmd/manyIndexes.go rename to dev-1/lesson-8.3/problems-demo/cmd/manyIndexes.go diff --git a/dev-1/problems-demo/cmd/oftenCompilation.go b/dev-1/lesson-8.3/problems-demo/cmd/oftenCompilation.go similarity index 100% rename from dev-1/problems-demo/cmd/oftenCompilation.go rename to dev-1/lesson-8.3/problems-demo/cmd/oftenCompilation.go diff --git a/dev-1/problems-demo/cmd/root.go b/dev-1/lesson-8.3/problems-demo/cmd/root.go similarity index 100% rename from dev-1/problems-demo/cmd/root.go rename to dev-1/lesson-8.3/problems-demo/cmd/root.go diff --git a/dev-1/problems-demo/cmd/wholeShardLocks.go b/dev-1/lesson-8.3/problems-demo/cmd/wholeShardLocks.go similarity index 100% rename from dev-1/problems-demo/cmd/wholeShardLocks.go rename to dev-1/lesson-8.3/problems-demo/cmd/wholeShardLocks.go diff --git a/dev-1/problems-demo/go.mod b/dev-1/lesson-8.3/problems-demo/go.mod similarity index 100% rename from dev-1/problems-demo/go.mod rename to dev-1/lesson-8.3/problems-demo/go.mod diff --git a/dev-1/problems-demo/go.sum b/dev-1/lesson-8.3/problems-demo/go.sum similarity index 100% rename from dev-1/problems-demo/go.sum rename to dev-1/lesson-8.3/problems-demo/go.sum diff --git a/dev-1/problems-demo/main.go b/dev-1/lesson-8.3/problems-demo/main.go similarity index 100% rename from dev-1/problems-demo/main.go rename to dev-1/lesson-8.3/problems-demo/main.go