1--f-e--d-d-c--f--g-h-gf-gh

1--k-kj--hg-h-gf--g-h-j--h-h-fg

1--d-cdca-cdc--df-fe-defe--fdefed-cdedcd-cdca

1--d-cdf-fg-f-f--f-f--gh-g-f