am e7b2b02d: am d6f614a4: Merge "Implement twalk(3), add unit tests."
* commit 'e7b2b02dec81271938e29aae09901ca37d2c3a12': Implement twalk(3), add unit tests.
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* commit 'e7b2b02dec81271938e29aae09901ca37d2c3a12': Implement twalk(3), add unit tests.