| find . -type d \( -name "*checkpoint*" -o -name "merge" \) -exec rm -rf {} + | |
| find . -type d \( -name "*checkpoint*" -o -name "merge" \) |
| find . -type d \( -name "*checkpoint*" -o -name "merge" \) -exec rm -rf {} + | |
| find . -type d \( -name "*checkpoint*" -o -name "merge" \) |