040000 tree 65b4f3689b401d70c628eeb0771cebefd0be15a3	01-identity
040000 tree bc85137308eb7b392cf2af4ad9a26be0c984a88d	02-dup
040000 tree d5eb5277332295b25711007e3f6db1b5e9c524b2	03-drop
040000 tree 13a21e460d4a7b85e31b6469a53f6e835aad7aff	04-observer