1--cdf-fg-f--f-gh-g--fe--fg-ef--de-fe-ed

1--dd-cdc--cd-d--d--fefg-defedcd-dc

1--cdf-fg-f--fe-fg-ef--d-defe-ed--d-cd

1--g-g-gh-hgfg-gf--fg-f-gh-hk-lkj-klkl-lk