install graphviz on macos

1. Press Command+Space and type Terminal and press enter/return key.
2. Run in Terminal app:

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ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

and press enter/return key. Wait for the command to finish.

1. Run:

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brew install graphviz

Done! You can now use graphviz.