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extraneous 'a'
in *Build the app*, replace: `if you want to use the a shorter option` with `if you want to use the shorter option`
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@ -156,7 +156,7 @@ Dockerfile app.py requirements.txt
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```
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Now run the build command. This creates a Docker image, which we're going to
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name using the `--tag` option. Use `-t` if you want to use the a shorter option.
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name using the `--tag` option. Use `-t` if you want to use the shorter option.
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```shell
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docker build --tag=friendlyhello .
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