Revert "Merge branch 'origin/MY-FIRST-I/O'"

This reverts commit 0ab86e4b20996f46355247ae73ddda6faf7f225f, reversing
changes made to 5f08c95f392fb8b92c2f29c640bb4f1092971758.
Revert "Merge branch 'origin/HELLO-WORLD'"

This reverts commit 5f08c95f392fb8b92c2f29c640bb4f1092971758, reversing
changes made to 3bc4ce1a91a8de575393fa5af0643cde72a6617e.